Version 3.3.3



  • Nothing so far :(


  • Nothing so far :)

Internal Changes

  • Nothing so far

Version 3.3.2

Released on April 19, 2024


  • Use more verbose page titles in management/admin areas (#6300)

  • Prioritize exact matches when searching for users (#6254)

  • Show document templates from non-parent categories and other events for cloning as long as the user has management access (#6232)

  • Warn about conflicts from concurrent edits of minutes (#3410, #6193)

  • Include up to two months (up from one week) of past events in dashboard iCal export (#6304)


  • Fix adding additional event keywords when some keywords have already been set (#6264, thanks @SegiNyn)

  • Fix overlapping times in some room booking timelines when using a locale with a 12-hour time format (#6263)

  • Fix error when printing badges referencing a linked regform picture field that contains no picture (#6276)

  • Fix error when creating a reminder for exactly one week before the event (#6283)

  • Fix error when unassigning the editor of an editable that has no editor (#6284)

  • Fix error when judging an editable from the list of editables (#6284)

  • Fix validation error when using a mailto: link in an email body (#6286)

  • Clear the flags indicating that registrations or a registration form field have been purged when cloning an event (#6288)

  • Use English locale when formatting dates for room booking log entries (#6295)

  • Fix date validation in room booking failing in certain timezones

Internal Changes

  • Allow plugins to fully replace the data in a ticket QR code with a custom string instead of just modifying/extending the JSON dict (#6266)

  • Replace deprecated pkg_resources with importlib from standard library (#6272, #6273, thanks @maxnoe)

Version 3.3.1

Released on April 01, 2024


Version 3.3

Released on March 30, 2024

Major Features

  • A new “Document Templates” module was added which supports the generation of fully customizable PDF documents for event participants such as receipts and certificates of attendance.

  • The Room Booking module now supports recurring bookings that repeat on specific weekdays. For example, a room can be booked every Monday and Wednesday over a set period of time.

  • Badge and ticket templates can now be linked to a registration form. This makes it possible to reference custom registration fields when creating the template.

  • The existing Indico Check-in app has been completely rewritten as a PWA (Progressive Web App). Please note that the old Check-in app has been deprecated and is not compatible with the new version of Indico. The new app can be found here.

  • A new badge/ticket setting has been added which, when enabled, makes it possible to print badges and/or tickets for accompanying persons in addition to the main registrant.

  • Users can now export all their data stored in Indico. This includes personal data and any data they are linked to such as registrations, minutes and files uploaded to Indico.

  • Users can now be anonymized in Indico; this means that all personal identifiers associated with a user will be removed from Indico, whilst only keeping the data that is required for Indico to function properly, in an anonymized manner. This operation can only be performed by Indico system administrators through the indico command-line interface.

  • Administrators now have the option to require users to accept the Terms of Use during signup and after the terms have been updated.

  • Event managers can require participants to accept the event’s Privacy Policy when registering.

  • Event tickets can now be added to Google Wallet using the new experimental Google Wallet integration. You can enable this feature using the ENABLE_GOOGLE_WALLET config setting and then configure it on the category level.

  • The category calendar view has been improved with new week/day views and new filtering options for category, venue, room or keywords.

  • Managers can now change the registration fee for selected registrations in bulk.

  • Lots of new accessibility improvements, including improved keyboard navigation, better color contrast, and better screen reader support.



  • Invalidate password reset links once the password has been changed (#5878)

  • Add full ACLs for custom conference menu items, instead of just being able to restrict them to speakers or registrants (#5670, thanks @kewisch)

  • Make editing timeline display much more straightforward (#5674)

  • Allow event managers to delete editables from contributions (#5778, #5892)

  • Allow room managers to add internal notes to bookings (#5746, #5791)

  • Support generating tickets and badges for each of the registrant’s accompanying persons (#5424)

  • Add keyboard shortcut (CTRL-SHIFT-A) to toggle room booking admin override (#5909)

  • Improve login page UI, allow overriding the logo URL (LOGIN_LOGO_URL config option) and using custom logos for auth providers (logo_url in the auth provider settings) (#5936, thanks @openprojects)

  • Show only active registration counts on the registration form management dashboard, and add an inactive registration count to the registration list (#5990)

  • Store creation date of users and show it to admins (#5957, thanks @vasantvohra)

  • Add option to hide links to Room Booking system for users who lack access (#5981, thanks @SegiNyn)

  • Support weekly room bookings that take place on multiple weekdays (#5829, #6000, #5806)

  • Hide events marked as invisible from builtin search results unless the user is a manager (#5947, thanks @openprojects)

  • Support sessions that expire at a certain date (specified by the used flask-multipass provider) regardless of activity when using an external login method (#5907, thanks @cbartz)

  • Allow configuring future months threshold for categories (#2984, #5928, thanks @kewisch)

  • Allow editors to edit their review comments on editables (#6008)

  • Auto-linking of patterns in minutes (e.g. issue trackers, Github repos…) (#5998)

  • Log editor actions in the Editing module (#6015)

  • Grant subcontribution speakers submission privileges by default in newly created events (#5905, #6025)

  • Stop overwhelmingly showing past events in the ‘Events at hand’ section in the user dashboard (#6049)

  • Add document templates to generate PDF receipts, certificates, and similar documents for event participants (#751, #5060, #6246, #5123, #6078, #6250)

  • Show which persons are external in the user search dialog (#6074)

  • Add feature for users to export all data linked to them (#5757)

  • Add Outlook online calendar button to share widget (#6075, #6077)

  • Remove Facebook and Google+ share widgets and make Twitter share button privacy-friendly (#6077)

  • Do not bother people registering using an invitation link with a CAPTCHA (#6095)

  • Add option to allow people to register using an invitation link even if the event is restricted (#6094)

  • Improve editing notifications emails (#6027, #6042, #6154)

  • Add a picture field for registration forms which can use the local webcam to take a picture in addition to uploading one, and also supports cropping/rotating the picture (#5922, thanks @SegiNyn)

  • Use a more compact registration ticket QR code format which is faster to scan and less likely to fail in poor lighting conditions (#6123)

  • Add a legend to the category calendar, allowing to filter events either by category, venue, room or keywords (#6105, #6106, #6128, #6148, #6149, #6127, #6110, #6158, #6183, thanks @Moliholy, @unconventionaldotdev)

  • Allow to configure a restrictive set of allowed keywords (#6127, #6183, thanks @Moliholy, @unconventionaldotdev).

  • Add week and day views in the category calendar and improve navigation controls (#6108, #6129, #6107, #6110, thanks @Moliholy, @unconventionaldotdev).

  • Add the ability to clone privacy settings (#6156, thanks @SegiNyn)

  • Add option for managers to change the registration fee of a set of registrations (#6132, #6138)

  • Add setting to configure whether room bookings require a reason (#6150, #6155, thanks @Moliholy, @unconventionaldotdev)

  • Add a “Picture” personal data field to registrations. When used, it allows including the picture provided by the user on badges/tickets (#6160, thanks @vtran99)

  • Support ~~text~~ to strike-out text in markdown (#6166)

  • Add experimental support for creating Google Wallet tickets (opt-in via ENABLE_GOOGLE_WALLET indico.conf setting) (#6028, thanks @openprojects)

  • Add option to exceptionally grant registration modification privileges to some registrants (#5264, #6152, thanks @Thanhphan1147)

  • Add option to require users to agree to terms during signup or after they have been updated (#5923, #5925, thanks @kewisch)

  • Add indico user delete CLI to attempt to permanently delete a user (#5838)

  • Add indico user anonymize CLI to permanently anonymize a user (#5838)

  • Add possibility to link room reservations to multiple events, session blocks and contributions (#6113, #6114, thanks @omegak, @unconventionaldotdev)

  • Store editable list filters in the browser’s local storage (#6192)

  • Take visibility restrictions into account in the atom feed (#5472, thanks @bpedersen2)

  • Allow linking badge templates to registration forms in order to use custom fields in them (#6088)

  • Allow filtering the list of editables by tags (#6195, #6197)

  • Warn users with a dialog before their session expires and let them extend it (#6026, thanks @SegiNyn)


  • Prevent room booking sidebar menu from overlapping with the user dropdown menu (#5910)

  • Allow cancelling pending bookings even if they have already “started” (#5995)

  • Disallow switching the repeat frequency of an existing room booking from weekly to monthly or vice versa (#5999)

  • Ignore deleted fields when computing the number of occupied slots for a registration (#6035)

  • Show the description of a subcontribution in conference events (#5946, #6056)

  • Only block templates containing a QR code via is_ticket_blocked (#6062)

  • Use custom map URL in event API if one is set (#6111, thanks @stine-fohrmann)

  • Use the event timezone when scheduling call for abstracts/papers (#6139)

  • Allow setting registration fees larger than 999999.99 (#6172)

  • Populate fields such as first and last name from the multipass login provider (e.g. LDAP) during sign-up regardless of synchronization settings (#6182)

  • Hide redundant affiliations tooltip on the Participant Roles list (#6201)

  • Correctly highlight required “yes/no” registration form field as invalid (#6109, #6242)

  • Include comments in the Paper Peer Reviewing JSON export (#6253)

  • Fail with a nicer error message when trying to upload a non-UTF8 CSV file (#6085, #6259)

  • Do not include unnecessary user data in JSON exports (#6260)


Internal Changes

  • Support and require Python 3.12 - older Python versions are no longer supported (#5978, #6249)

  • Use (dart-)sass instead of the deprecated node-sass/libsass for CSS compilation (#5734)

  • Add event.is_field_data_locked signal, allowing plugins to lock registration form fields on a per-registration basis (#5424)

  • Replace WYSIWYG (rich-text) editor with TinyMCE, due to the license and branding requirements of the previous editor (#5938)

  • Add a new Indico design system (#5914, thanks @foxbunny)

  • Add event.registration_form_field_deleted signal, allowing plugins to handle the removal of registration form fields (#5924)

  • Add a tool bin/managemnent/ to generate CSS for icomoon icons based on selection.json (#5986, thanks @foxbunny)

  • Pass form class arguments to core.add_form_fields signal handlers (#6020, thanks @vtran99)

  • Remove watchman reloader support, use watchfiles instead (#5978)

  • Improve indico i18n CLI to support plugin-related i18n operations (#5906, #5961, thanks @SegiNyn)

  • Use ruff for linting Python code (#6037)

  • Add <ind-menu> custom element for managing drop-down menus (#5896, #5897, thanks @foxbunny)

  • Allow plugins to add extra fields to the room booking form (#6126, thanks @VojtechPetru)

Version 3.2.9

Released on January 23, 2024

Security fixes

  • Update Werkzeug library due to a DoS vulnerability while parsing certain file uploads (CVE-2023-46136)

  • Fix registration form CAPTCHA not being fully validated (#6096)


  • Add placeholders for accompanying persons to the badge/ticket designer (#6033)


  • Fix meeting timetable not showing custom locations when all top-level timetable entries are session blocks inheriting the custom location from its session (#6014)

  • Always show exact matches when searching for existing videoconference rooms to attach to an event (#6022)

  • Include materials linked to sessions in the material package (#6024)

  • Use the correct locale when sending sending email notifications to others in an event (#5987, #6021)

  • Fix the author/speaker selector (e.g. for abstracts) breaking when submitting the form and getting a validation error (#6043, #6053)

  • Do not cancel past linked room bookings when deleting an event (#6032, #6051)

  • Fix contribution list filters being obscured by the action dialog (#6055)

  • Fix emailing Paper Peer Reviewing and Editing teams (#6145)

Internal Changes

  • None so far

Version 3.2.8

Released on October 11, 2023

Security fixes


  • New translation: Italian


  • Fix error when sending registration invitation reminders (#5879, #5880, thanks @bpedersen2)

  • Fix accessing the conference overview page when the default conference home page is set to a custom page (#5882)

  • Show percentages for multi-choice survey answers based on number of answers instead of total number of choices selected (#5930)

Version 3.2.7

Released on August 02, 2023


  • Fix not being able to remove the last entry from a room ACL (#5863, thanks @SegiNyn)

  • Fix conditional fields remaining hidden in abstract judgment form (#5873)

Version 3.2.6

Released on July 20, 2023

Security fixes

  • Fix an XSS vulnerability in various confirmation prompts commonly used when deleting things. Exploitation requires someone with at least submission privileges (such as a speaker) and then rely on someone else to attempt to delete this content. However, considering that event organizers may indeed delete suspicious-looking content when encountering it, there is a non-negligible risk of such an attack to succeed. Because of this it is strongly recommended to upgrade as soon as possible (#5862, CVE-2023-37901)


  • New translation: Czech


  • Show which files were added or modified on each editing timeline revision (#5802)

  • Support rendering Japanese, Chinese & Korean letters in PDFs (#3120, #5842, thanks @adamjenkins)

  • Add button to adapt columns widths on the reviewing area’s abstracts list (#5837)

  • Allow cloning category-level badge/poster templates into another category (#5775, thanks @SegiNyn)

  • Allow using a custom link text in the {event_link} email placeholder, using the {event_link:something-else-here} syntax (#5858, #5860)

  • Add option to add “event cancelled” semantics for event labels, which will disable reminders for events having this label (#5285, #5861)


  • Use correct name formatting in person link fields (#5835)

Internal Changes

  • Support Python 3.11

Version 3.2.5

Released on June 26, 2023

Security fixes

  • Fix an XSS vulnerability in the LaTeX \href macro when rendering it client-side. Previously, it was possible to embed arbitrary JavaScript there using the javascript: protocol. The underlying MathJax library has now been updated to version 3 which allows blacklisting certain protocols, thus allowing only http, https and mailto links in \href macros (#5818)


  • Show actual recipient data in the email preview instead of the that of the event creator (#5794)

  • Add an option to set a maximum number of choices in a multi-choice field (#5800)


  • Fix width of time column in PDF timetable when using 12-hour time format (#5788)

  • Fix wrong date in email subject for room booking occurrence cancellations (#5790)

  • Fix excessive queries being sent in meetings that have registration form with limited places and many registrants (#5799)

  • Fix extremely slow query when retrieving list of registration forms in conferences with many registrants while not logged in (#5799)

  • Fix title of session conveners being always empty in HTTP API with XML serialization (#5813)

  • Fix editable filters not working simultaneously with editable search (#5796)

  • Fix missing icons in Abstract Markdown editor (#5815)

  • Fix text overflow in event manage button (#5816)

  • Fix undone revisions being used instead of the latest valid one when downloading revision files as a ZIP archive (#5820)

  • Fix custom actions not showing on revisions if the latest revision has been undone (#5820)

Internal Changes

  • Some basic but useful docs for the Registration Form model classes

Version 3.2.4

Released on May 26, 2023

Security fixes

  • Set Vary: Cookie header when session data is present and used. This ensures that data linked to a (logged-in) session cannot leak between requests even in case of a poorly-configured caching proxy in front of Indico (#5753)


  • Use the revision’s timestamp when downloading its files as a ZIP archive (#5686)

  • Use more consistent colors on the editing judgment button (#5687, #5697)

  • Keep history when undoing judgments on editables (#5630)

  • Add search field to the abstracts list for reviewers (#5698, #5703)

  • Align status box colors with judgment dropdown (#5699, #5706)

  • Use a gender-neutral chairperson icon (#5710)

  • Add option to set the abstracts’ primary authors as the default submitters for the corresponding contributions (#5711)

  • Allow commenting on accepted/rejected editables (#5712, #5722)

  • Hide deleted sections and fields from registration summary (#5716)

  • Add support for authorized submitters in Call for Papers (#5728)

  • Display abstract submission comment in the list of abstracts (#5733)

  • Allow searching for contributions by author in the management area (#5742)

  • Include start/end dates of the whole booking in the timeline tooltip of recurring room bookings (#5730, #5740)

  • Add day of the week to room booking details modal and timeline (#5718, #5743)

  • Allow acceptance and rejection of editables in the editable list (#5721)

  • Email verification attempts during signup now trigger rate limiting to prevent spamming large amounts of confirmation emails (#5727)

  • Allow bulk-commenting editables in the editable list (#5747)

  • Allow emailing contribution persons that have not yet made any submissions to a given editable type (#5755)

  • Show only “ready to review” editables on the “get next editable” list (#5765)

  • Disallow uploading empty files (#5767)

  • Include non-speaker authors in the timetable export API (#5412, #5738)

  • Add setting to force track selection when accepting abstracts (#5771)

  • Log detailed changes when editing contributions (#5777)

  • Allow managers to ignore required field restrictions in registration forms (#5644, #5682, thanks @kewisch)

  • Allow selecting the global noreply address as the sender for event reminders (#5784)

  • Allow admins to change the password of local accounts (#5789, thanks @omegak)


  • Fix creating invited abstracts (#5696)

  • Fix error on contribution page when there is no paper but the peer reviewing module is enabled and configured to hide accepted papers

  • Clone all protection settings (in particular submitter privileges) when cloning events (#5702)

  • Fix searching in single-choice dropdown fields in registration forms (#5709)

  • Fix uploading files in registration forms where the user only has access through the registration’s token (#5719)

  • Fix being unable to set the “speakers and authors” as the default contribution submitter type (#5711)

  • Check server-side if Call for Papers is open when submitting a paper (#5725)

  • Fix room notification email list showing up empty when editing it (#5729, #5731)

  • Fix performance issues in paper assignment list (#5736)

  • Fix performance issues in event export API with large events when including contributions (#5736)

  • Fix error when a search query matches content from unlisted events (#5759, #5761)

  • Fix ToS and Privacy Policy links in room booking module not working when using an external URL (#5774)

  • Do not apply default values to new registration form fields when editing an existing registration (#5781)

  • Allow 0 for a required registration form numbe field (unless a higher minimum value is set) (#5781)

Internal Changes

  • Update Python & JavaScript dependencies (#5726, #5752)

  • Add support for the watchfiles live reloader (#5732)

  • Add an endpoint to allow resetting the state of an accepted editable to “ready to review” (#5758)

  • Add RESTful endpoints for custom contribution fields (#5768)

Version 3.2.3

Released on February 23, 2023

Security fixes


The risk of malicious HTML (e.g. scripts) in the global announcement is minimal as only Indico administrators can set such an announcement anyway. However, in the unlikely case that an administrator becomes malicious or is compromised, they would have been be able to perform XSS against their Indico instance.


  • Include co-authors in abstract list columns and spreadsheet exports (#5605)

  • Include speakers in abstract list columns and spreadsheet exports (#5615)

  • Add an option to export all events in a series to ical at once (#5617, #5620)

  • Make it possible to load more events in series management (#5629)

  • Check manually entered email addresses of speakers/authors/chairpersons to avoid collisions and inconsistencies (#5478)

  • Add option to use review track as accepted track when bulk-accepting abstracts (#5608)

  • Add setting to only allow managers to upload attachments to events and contributions (#5597)

  • Support Markdown when writing global announcement and apply standard HTML sanitization to the message (#5640)

  • Add BCC field on contribution email dialogs (#5637)

  • Allow filtering by location in room booking (#4291, #5622, thanks @mindouro)

  • Add button to adapt column widths in paper & contribution lists (#5642)

  • Add event language settings to set default and additional languages (#5606, #5607, thanks @vasantvohra)

  • Fail nicely when trying to import an event from another Indico instance (#5619, #5653)

  • Add option to send reminders to invited registrants who have not yet responded (#5579, #5654)

  • Hide the top box with the latest files of an editable until it has been accepted and published (#5660, #5665)

  • Allow uploading files when requesting changes on the editing timeline (#5612)

  • Add locked_fields to the identity provider settings in indico.conf to prevent non-admin users from turning off their profile’s personal data synchronization (#5648)

  • Add an option to sync event persons with users (#5677)

  • Disallow repeated filenames in editing revisions (#5681)

  • Add setting to hide peer-reviewed papers from participants even after they have been accepted (#5666, #5671)

  • Prevent concurrent assignment of editors to editables (#5684)

  • Add color labels to the filter dropdown (#5675, #5680)


  • Correctly show contribution authors in participant roles list (#5603)

  • Disable Sentry trace propagation to outgoing HTTP requests (#5604)

  • Include token in notification emails for private surveys (#5618)

  • Fix some API calls not working with personal access tokens (#5627)

  • Correctly handle paragraphs and linebreaks in plaintext conversion (#5623)

  • Send manager notifications and email participant if they withdraw from an event (#5633, #5638, thanks @kewisch)

  • Do not break registrations with purged accommodation fields (#5641, #5643)

  • Do not show blocked rooms as available on the very last day of the blocking (#5663)

  • Do not show blocked rooms as available for admins unles they have admin override mode enabled (#5663)

  • Fix roles resetting to the default ones when editing person data in an abstract or contribution (#5664)

  • Correctly show paragraphs in CKEditor fields (#5624, #5656, thanks @kewisch)

  • Fix empty iCal file being attached when registering for a protected event (#5688)

Internal Changes

  • Add rh.before-check-access signal (#5639, thanks @omegak)

  • Add indico celery --watchman ... to run Celery with the Watchman reloader (#5667)

  • Allow overriding the cache TTL for remote group membership checks (#5672)

  • Allow a custom editing workflow service to mark new editables as ready-for-review without creating a new replacement revision (#5668)

  • Update Python dependencies (#5689)

Version 3.2.2

Released on December 09, 2022


  • Display program codes in ‘My contributions’ (#5573)

  • Warn when a user cannot create an event in the current category (#5572)

  • Display all contributions in ‘My contributions’ and not just those with submitter privileges (#5575)

  • Apply stronger sanitization on rich-text content pasted into CKEditor (#5560, #5571)

  • Allow raw HTML snippets when editing custom conference pages and event descriptions (#5584, #5587)

  • Warn more clearly that link attachments are just a link and do not copy the file (#5551, #5593)

  • Add option to email people with specific roles about their contributions or abstracts (#5598)

  • Add setting to allow submitters to edit custom fields in their contributions (#5599)


  • Fix broken links in some notification emails (#5567)

  • Fix always-disabled submit button when submitting an agreement response on someone’s behalf (#5574)

  • Disallow nonsensical retention periods and visibility durations (#5576)

  • Fix sorting by program code in editable list (#5582)

  • Do not strip custom CSS classes from HTML in CKEditor (#5584, #5585)

  • Use the instance’s default locale instead of “no locale” (US-English) in places where no better information is known for email recipients (#5586)

Internal Changes

  • Refactor email-sending dialog using React (#5547)

Version 3.2.1

Released on November 10, 2022

Security fixes


We do not think that Indico is affected by those vulnerabilities as it does not use the cryptography library itself, and the dependency that uses it is only used during SSO (OAuth) logins and most likely in a way that is not vulnerable. It is nonetheless recommended to update as soon as possible.



  • Enable better image linking UI in CKEditor (#5492)

  • Restore the “fullscreen view” option in CKEditor (#5505)

  • Display & enforce judging deadline (#5506)

  • Add a setting to disable entering persons in person link fields manually (#5499)

  • Allow taking minutes in markdown (#3386, #5500, thanks @Leats)

  • Add setting to preselect “Include users with no Indico account” when adding authors/speakers (#5553)

  • Include event label in email reminders (#5554, #5556, thanks @omegak)

  • Include emails of submitters, speakers and authors in abstract/contribution Excel/CSV exports (#5565)


  • Fix meeting minutes being shown when they are expected to be hidden (#5475)

  • Force default locale when generating Book of Abstracts (#5477)

  • Fix width and height calculation when printing badges (#5479)

  • Parse escaped quotes (&quot;) in ckeditor output correctly (#5487)

  • Fix entering room name if room booking is enabled but has no locations (#5495)

  • Fix privacy information dropdown not opening on Safari (#5507)

  • Only let explicitly assigned reviewers review papers (#5527)

  • Never count participants from a registration forms with a fully hidden participant list for the total count on the participant page (#5532)

  • Fix “Session Legend” not working in all-days timetable view (#5539)

  • Fix exporting unlisted events via API (#5555)

Internal Changes

  • Require at least Postgres 13 during new installations. This check can be forced on older Postgres versions (11+ should work), but we make no guarantees that nothing is broken (the latest version we test with is 12) (#5503)

  • Refactor service request email generation so plugins can override sender and reply-to addresses for these emails (#5501)

  • Deleting a session no longer leaves orphaned session blocks (#5533, thanks @omegak)

  • Indicate in the registration_deleted signal whether it’s a permanent deletion from the database or just a soft-deletion (#5559)

Version 3.2

Released on August 25, 2022

Major Features

  • The registration form frontend has been completely rewritten using modern web technology.

  • Registrations can now have a retention period for the whole registration and individual fields, after which their data is permanently deleted.

  • The participant list of an event can now use consent to determine whether a participant should be displayed, and its visibility can be different for the general public and other registered participants.

  • An event can now have one or more privacy notices and it’s possible to set the name and contact information of the “Data controller” (useful where GDPR or similar legislation applies).


  • New translation: German


  • Add a new event management permission that grants access only to the abstracts module (#5212)

  • Add a link to quickly view the current stylesheet on the conference layout customization page (#5239, #5259)

  • Add more powerful filters to “get next editable” and the list of editables (#5188, #5224, #5241)

  • Add the ability to create speaker-only menu entries for conferences (#5261, #5268)

  • Highlight changed fields in notification emails about modified registrations (#5265, #5269)

  • Add an option to send notifications of new abstract comments (#5266, #5284)

  • Badge/poster templates can have additional images besides the background image (#5273, thanks @SegiNyn)

  • Add ability to add alerts to iCal exports (#5318, #5320, thanks @PerilousApricot)

  • Show affiliations of submitters and authors in abstract/contribution lists and add an extra column with this information to Excel/CSV exports (#5330)

  • Add option to delete persons from the event if they have no roles or other ties to the event anymore (#5294, #5313)

  • Allow events to be favorited (#1662, #5338, thanks @Leats)

  • Include abstract content in CSV/Excel export if enabled in the abstract list (#5356, #5372, thanks @rppt)

  • Add the ability to include an optional static javascript file when defining custom conference themes from within a plugin (#5414, thanks @brittyazel)

  • Add option to make the ‘Affiliation’ and ‘Comment’ fields mandatory in the account request form (#4819, #5389, thanks @elsbethe)

  • Include tags in registrant API (#5441)

  • Subcontribution speakers can now be granted submission privileges in the event’s protection settings (#2363, #5444)

  • Registration forms can now require a CAPTCHA when the user is not logged in (#4698, #5400)

  • Account creation now requires a CAPTCHA by default to prevent spam account creation (#4698, #5446)

  • Add contribution’s program code to revision’s “Download ZIP” filename (#5449)

  • Add UI to manage series of events (#4048, #5436, thanks @Leats)

  • Event series can now specify a title pattern to use when cloning an event in the series (#5456)

  • Insert new categories into the correct position if the list is already sorted (#5455)

  • Images can now be uploaded by pasting or dropping them into the editor for minutes or the event description (#5458)

  • Add JSON export for contribution details (#5460)


  • Fix selected state filters not showing up as selected in abstract list customization (#5363)

  • Do not propose an impossible date/time in the Room Booking module when accessing it shortly before midnight (#5371)

  • Do not fail when viewing an abstract that has been reviewed in a track which has been deleted in the meantime (#5386)

  • Fix error when editing a room’s nonbookable periods (#5390)

  • Fix incorrect access check when directly accessing a registration form (#5406)

  • Fix error in rate limiter when using Redis with a UNIX socket connection (#5391)

  • Ensure that submitters with contribution edit privileges can only edit basic fields (#5425)

  • Do not return the whole contribution list when editing a contribution from elsewhere (#5425)

  • Fix session blocks not being sorted properly in a timetable PDF export when they have the same start time (#5426)

  • Fix printing badges containing text elements with malformed HTML (#5437, thanks @omegak)

  • Fix misleading start and end times for Poster contributions in the timetable HTTP API and the contributions placeholder in emails (#5443)

  • Do not mark persons as registered if the registration form has been deleted (#5448)

  • Fix error when a room owner who is not an admin edits their room (#5457)

Internal Changes

  • When upgrading an existing instance, Postgres 11 or newer is required. The upgrade will fail on Postgres 9.6 (or 10).

  • Add new regform-container-attrs template hook to pass additional (data-)attributes to the React registration form containers (#5271)

  • Add support for JavaScript plugin hooks to register objects or react components for use by JS code that’s in the core (#5271)

  • Plugins can now define custom registration form fields (#5282)

  • Add EMAIL_BACKEND configuration variable to support different email sending backends e.g. during development (#5375, #5376, thanks @Moist-Cat)

  • Make model attrs to clone interceptable by plugins (#5403, thanks @omegak)

  • Add signal_query method in the IndicoBaseQuery class and the db_query signal, allowing to intercept and modify queries by signal handlers (#4981, thanks @omegak).

  • Update WYSIWYG editor to CKEditor 5, resulting in a slightly different look for the editor controls and removal of some uncommon format options (#5345)

Version 3.1.2



Internal Changes

  • Let payment plugins ignore pending transactions if they are expired (#5357)

Version 3.1.1

Released on April 27, 2022


  • Prompt before leaving the event protection page without saving changes (#5222)

  • Add the ability to clone abstracts (#5217)

  • Add setting to allow submitters to edit their own contributions (#5213)

  • Update the editing state color scheme (#5236)

  • Include program codes in export API (#5246)

  • Add abstract rating scores grouped by track (#5298)

  • Allow uploading revisions when an editor hasn’t been assigned (#5289)


  • Fix published editable files only being visible to users with access to the editing timeline (#5218)

  • Fix incorrect date in multi-day meeting date selector dropdown in certain timezones (#5223)

  • Remove excessive padding around category titles (#5225)

  • Fix error when exporting registrations to PDFs that contained certain invalid HTML-like sequences (#5233)

  • Restore logical order of registration list columns (#5240)

  • Fix a performance issue in the HTTP API when exporting events from a specific category while specifying a limit (only affected large databases) (#5260)

  • Correctly specify charset in iCalendar files attached to emails (#5228, #5258, thanks @imranyusuff)

  • Fix very long map URLs breaking out of the event management settings box (#5275)

  • Fix missing abstract withdrawal notification (#5281)

  • Fix downloading files from editables without a published revision (#5290)

  • Do not mark participants with deleted/inactive registrations as registered in participant roles list (#5308)

  • Do not enforce personal token name uniqueness across different users (#5317)

  • Fix last modification date not updating when an abstract is edited (#5325)

  • Fix a bug with poster and badge printing in unlisted events (#5322)

Internal Changes

  • Add category-sidebar template hook and blocks around category sidebar sections (#5237, thanks @omegak)

  • Add event.reminder.before_reminder_make_email signal (#5242, thanks @vasantvohra)

  • Add plugin.interceptable_function signal to intercept selected function calls (#5254)

Version 3.1

Released on January 11, 2022

Major Features

  • Category managers now see a log of all changes made to their category in a category log (similar to the event log). This log includes information about all events being created, deleted or moved in the category (#2809, #5029)

  • Besides letting everyone create events in a category or restricting it to specific users, categories now also support a moderation workflow which allows event managers to request moving an event to a category. Only once a category manager approves this request, the event is actually moved (#2057, #5013)

  • Admins now have the option to enable “Unlisted events”, which are events that are not (yet) assigned to a category. Such events are only accessible to its creator and other users who have been granted access explicitly, and do not show up in any category’s event listing (#4294, #5055, #5023, #5095)


  • Send event reminders as individual emails with the recipient in the To field instead of using BCC (#2318, #5088)

  • Let event managers assign custom tags to registrations and filter the list of registrations by the presence or absence of specific tags (#4948, #5091)

  • Allow importing registration invitations from a CSV file (#3673, #5108)

  • Show event label on category overviews and in iCal event titles (#5140, #5143)

  • Let event managers view the final timetable even while in draft mode (#5141, #5145)

  • Add option to export role members as CSV (#5147, #5156)

  • Include attachment checksums in API responses (#5084, #5169, thanks @avivace)

  • iCalendar invites now render nicely in Outlook (#5178)

  • Envelope senders for emails can now be restricted to specific addresses/domains using the SMTP_ALLOWED_SENDERS and SMTP_SENDER_FALLBACK config settings (#4837, #2224, #1877, #5179)

  • Allow filtering the contribution list based on whether any person (speaker or author) has registered for the event or not (#5192, #5193)

  • Add background color option and layer order to badge/poster designer items (#5139, thanks @SegiNyn)

  • Allow external users in event/category ACLs (#5146)


  • Fix CUSTOM_COUNTRIES not overriding names of existing countries (#5183)

  • Fix error dialog when submitting an invited abstract without being logger in (#5200)

  • Fix category picker search displaying deleted categories (#5197, #5203)

  • Fix editing service API calls using the service token (#5170)

  • Fix excessive retries for Celery tasks with a retry wait time longer than 1 hour (#5172)

Version 3.0.4



  • Allow external users in event/category ACLs (#5146)


  • Fix editing service API calls using the service token (#5170)

  • Fix excessive retries for Celery tasks with a retry wait time longer than 1 hour (#5172)

Version 3.0.3

Released on October 28, 2021

Security fixes

  • Protect authentication endpoints against CSRF login attacks (#5099, thanks @omegak)


  • Support TLS certificates for SMTP authentication (#5100, thanks @dweinholz)

  • Add CSV/Excel contribution list exports containing affiliations (#5114, #5118)

  • Include program codes in contribution PDFs and spreadsheets (#5126)

  • Add an API for bulk-assigning contribution program codes programmatically (#5115, #5120)

  • Add layout setting to show videoconferences on the main conference page (#5124)


  • Fix certain registration list filters (checkin status & state) being combined with OR instead of AND (#5101)

  • Fix translations not being taken into account in some places (#5073, #5105)

  • Use correct/consistent field order for personal data fields in newly created registration forms

  • Remove deleted registration forms from ACLs (#5130, #5131, thanks @jbtwist)

Internal Changes

  • Truncate file names to 150 characters to avoid hitting file system path limits (#5116, thanks @vasantvohra)

Version 3.0.2

Released on September 09, 2021


  • Fix JavaScript errors on the login page which caused problems when using multiple form-based login methods (e.g. LDAP and local Indico accounts)

Version 3.0.1

Released on September 08, 2021


  • Allow filtering abstracts by custom fields having no value (#5033, #5034)

  • Add support for syncing email addresses when logging in using external accounts (#5035)

  • Use more space-efficient QR code version in registration tickets (#5052)

  • Improve user experience when accessing an event restricted to registered participants while not logged in (#5053)

  • When searching external users, prefer results with a name in case of multiple matches with the same email address (#5066)

  • Show program codes in additional places (#5075)

  • Display localized country names (#5070, #5076)


  • Show correct placeholders in date picker fields (#5022)

  • Correctly preselect the default currency when creating a registration form

  • Do not notify registrants when a payment transaction is created in “pending” state

  • Keep the order of multi-choice options in registration summary (#5020, #5032)

  • Correctly handle relative URLs in PDF generation (#5042, #5044)

  • Render markdown in track descriptions in PDF generation (#5043, #5044)

  • Fix error when importing chairpersons from an existing event (#5047)

  • Fix broken timetable entry permalinks when query string args are present (#5049)

  • Do not show “Payments” event management menu entry for registration managers (#5072)

  • Replace some hardcoded date formats with locale-aware ones (#5059, #5071)

  • Clone the scientific program description together with tracks (#5077)

  • Fix database error when importing registrations to an event that already contains a deleted registration form with registrations (#5078)

Internal Changes

  • Add event.before_check_registration_email signal (#5021, thanks @omegak)

  • Do not strip image maps in places where HTML is allowed (#5026, thanks @bpedersen2)

  • Add event.registration.after_registration_form_clone signal (#5037, thanks @vasantvohra)

  • Add registration-invite-options template hook (#5045, thanks @vasantvohra)

  • Fix Typeahead widget not working with extra validators (#5048, #5050, thanks @jbtwist)

Version 3.0

Released on July 16, 2021

Major Features

  • Add system notices which inform administrators about important things such as security problems or outdated Python/Postgres versions. These notices are retrieved once a day without sending any data related to the Indico instance, but if necessary, this feature can be disabled by setting SYSTEM_NOTICES_URL to None in indico.conf (#5004)

  • It is now possible to use SAML SSO for authentication without the need for Shibboleth and Apache (#5014)


  • Fix formatting and datetime localization in various PDF exports and timetable tab headers (#5009)

  • Show lecture speakers as speakers instead of chairpersons on the participant roles page (#5008)

Internal Changes

  • Signals previously exposed directly via now need to be accessed using their explicit name, i.e. (#5007)

  • Add category.extra_events signal (#5005, thanks @omegak)

Version 3.0rc2

Released on July 09, 2021

Major Features

  • Add support for personal tokens. These tokens act like OAuth tokens, but are associated with a specific user and generated manually without the need of doing the OAuth flow. They can be used like API keys but with better granularity using the same scopes OAuth applications have, and a single user can have multiple tokens using various scopes. By default any user can create such tokens, but admins can restrict their creation. (#1934, #4976)


  • Add abstract content to the abstract list customization options (#4968)

  • Add CLI option to create a series (#4969)

  • Users cannot submit multiple anonymous surveys anymore by logging out and in again (#4693, #4970)

  • Improve reviewing state display for paper reviewers (#4979, #4984)

  • Make it clearer if the contributions/timetable of a conference are still in draft mode (#4977, #4986)

  • Add “send to speakers” option in event reminders (#4958, #4966, thanks @Naveenaidu)

  • Allow displaying all events descending from a category (#4982, #4983, thanks @omegak and @openprojects).

  • Add an option to allow non-judge conveners to update an abstract track (#4989)


  • Fix errors when importing events containing abstracts or event roles from a YAML dump (#4995)

  • Fix sorting abstract notification rules (#4998)

  • No longer silently fall back to the first event contact email address when sending registration emails where no explicit sender address has been configured (#4992, #4996, thanks @vasantvohra)

  • Do not check for event access when using a registration link with a registration token (#4991, #4997, thanks @vasantvohra)

Version 3.0rc1

Released on June 25, 2021

Major Features

  • There is a new built-in search module which provides basic search functionality out of the box, and for more advanced needs (such as full text search in uploaded files) plugins can provide their own search functionality (e.g. using ElasticSearch). (#4841)

  • Categories may now contain both events and subcategories at the same time. During the upgrade to 3.0 event creation is automatically set to restricted in all categories containing subcategories in order to avoid any negative surprises which would suddenly allow random Indico users to create events in places where they couldn’t do so previously. (#4679, #4725, #4757)

  • The OAuth provider module has been re-implemented based on a more modern library (authlib). Support for the somewhat insecure implicit flow has been removed in favor of the code-with-PKCE flow. Tokens are now stored more securely as a hash instead of plaintext. For a given user/app/scope combination, only a certain amount of tokens are stored; once the limit has been reached older tokens will be discarded. The OAuth provider now exposes its metadata via a well-known URI (RFC 8414) and also has endpoints to introspect or revoke a token. (#4685, #4798)

  • User profile pictures (avatars) are now shown in many more places throughout Indico, such as user search results, meeting participant lists and reviewing timelines. (#4625, #4747, #4939)


  • New locale: English (United States)

  • New translation: Turkish


  • Use a more modern search dialog when searching for users (#4674, #4743)

  • Add an option to refresh event person data from the underlying user when cloning an event (#4750, #4760)

  • Add options for attaching iCal files to complete registration and event reminder emails (#1158, #4780)

  • Use the new token-based URLs instead of API keys for persistent ical links and replace the calendar link widgets in category, event, session and contribution views with the more modern ones used in dashboard (#4776, #4801)

  • Add an option to export editables to JSON (#4767, #4810)

  • Add an option to export paper peer reviewing data to JSON (#4767, #4818)

  • Passwords are now checked against a list of breached passwords (“Have I Been Pwned”) in a secure and anonymous way that does not disclose any data. If a user logs in with an insecure password, they are forced to change it before they can continue using Indico (#4817)

  • Failed login attempts now trigger rate limiting to prevent brute-force attacks (#1550, #4817)

  • Allow filtering the “Participant Roles” page by users who have not registered for the event (#4763, #4822)

  • iCalendar exports now include contact data, event logo URL and, when exporting sessions/contributions, the UID of the related event. Also, only non-empty fields are exported. (#4785, #4586, #4587, #4791, #4820)

  • Allow adding groups/roles as “authorized abstract submitters” (#4834)

  • Direct links to (sub-)contributions in meetings using the URLs usually meant for conferences now redirect to the meeting view page (#4847)

  • Use a more compact setup QR code for the mobile Indico check-in app; the latest version of the app is now required. (#4844)

  • Contribution duration fields now use a widget similar to the time picker that makes selecting durations easier. (#2462, #4873)

  • Add new meeting themes that show sequential numbers instead of start times for contributions (#4899)

  • Remove the very outdated “Compact style” theme (it’s still available via the themes_legacy plugin) (#4900, #4899)

  • Support cloning surveys when cloning events (#2045, #4910)

  • Show external contribution references in conferences (#4928, #4933)

  • Allow changing the rating scale in abstract/paper reviewing even after reviewing started (#4942)

  • Allow blacklisting email addresses for user registrations (#4644, #4946)


  • Take registrations of users who are only members of a custom event role into account on the “Participant Roles” page (#4822)

  • Fail gracefully during registration import when two rows have different emails that belong to the same user (#4823)

  • Restore the ability to see who’s inheriting access from a parent object (#4833)

  • Fix misleading message when cancelling a booking that already started and has past occurrences that won’t be cancelled (#4719, #4861)

  • Correctly count line breaks in length-limited abstracts (#4918)

  • Fix error when trying to access subcontributions while event is in draft mode

  • Update the user link in registrations when merging two users (#4936)

  • Fix error when exporting a conference timetable PDF with the option “Print abstract content of all contributions” and one of the abstracts is too big to fit in a page (#4881, #4955)

  • Emails sent via the Editing module are now logged to the event log (#4960)

  • Fix error when importing event notes from another event while the target event already has a deleted note (#4959)

Internal Changes

  • Require Python 3.9 - older Python versions (especially Python 2.7) are no longer supported

  • confId has been changed to event_id and the corresponding URL path segments now enforce numeric data (and thus pass the id as a number instead of string)

  • CACHE_BACKEND has been removed; Indico now always uses Redis for caching

  • The integration with flower (celery monitoring tool) has been removed as it was not widely used, did not provide much benefit, and it is no longer compatible with the latest Celery version

  • session.user now returns the user related to the current request, regardless of whether it’s coming from OAuth, a signed url or the actual session (#4803)

  • Add a new check_password_secure signal that can be used to implement additional password security checks (#4817)

  • Add an endpoint to let external applications stage the creation of an event with some data to be pre-filled when the user then opens the link returned by that endpoint (#4628, thanks @adl1995)

Version 2.3.6



  • None so far :)

Version 2.3.5

Released on May 11, 2021

Security fixes

  • Fix XSS vulnerabilities in the category picker (via category titles), location widget (via room and venue names defined by an Indico administrator) and the “Indico Weeks View” timetable theme (via contribution/break titles defined by an event organizer). As neither of these objects can be created by untrusted users (on a properly configured instance) we consider the severity of this vulnerability “minor” (#4897)


  • New translation: Polish

  • New translation: Mongolian


  • Add an option to not disclose the names of editors and commenters to submitters in the Paper Editing module (#4829, #4865)


  • Do not show soft-deleted long-lasting events in category calendar (#4824)

  • Do not show management-related links in editing hybrid view unless the user has access to them (#4830)

  • Fix error when assigning paper reviewer roles with notifications enabled and one of the reviewing types disabled (#4838)

  • Fix viewing timetable entries if you cannot access the event but a specific session inside it (#4857)

  • Fix viewing contributions if you cannot access the event but have explicit access to the contribution (#4860)

  • Hide registration menu item if you cannot access the event and registrations are not exempt from event access checks (#4860)

  • Fix inadvertently deleting a file uploaded during the “make changes” Editing action, resulting in the revision sometimes still referencing the file even though it has been deleted from storage (#4866)

  • Fix sorting abstracts by date (#4877)

Internal Changes

  • Add before_notification_send signal (#4874, thanks @omegak)

Version 2.3.4

Released on March 11, 2021

Security fixes

  • Fix some open redirects which could help making harmful URLs look more trustworthy by linking to Indico and having it redirect the user to a malicious site (#4814, #4815)

  • The BASE_URL is now always enforced and requests whose Host header does not match are rejected. This prevents malicious actors from tricking Indico into sending e.g. a password reset link to a user that points to a host controlled by the attacker instead of the actual Indico host (#4815)


If the webserver is already configured to enforce a canonical host name and redirects or rejects such requests, this cannot be exploited. Additionally, exploiting this problem requires user interaction: they would need to click on a password reset link which they never requested, and which points to a domain that does not match the one where Indico is running.


  • Fail more gracefully is a user has an invalid locale set and fall back to the default locale or English in case the default locale is invalid as well

  • Log an error if the configured default locale does not exist

  • Add ID-1 page size for badge printing (#4774, thanks @omegak)

  • Allow managers to specify a reason when rejecting registrants and add a new placeholder for the rejection reason when emailing registrants (#4769, thanks @vasantvohra)


  • Fix the “Videoconference Rooms” page in conference events when there are any VC rooms attached but the corresponding plugin is no longer installed

  • Fix deleting events which have a videoconference room attached which has its VC plugin no longer installed

  • Do not auto-redirect to SSO when an MS office user agent is detected (#4720, #4731)

  • Allow Editing team to view editables of unpublished contributions (#4811, #4812)

Internal Changes

  • Also trigger the ical-export metadata signal when exporting events for a whole category

  • Add primary_email_changed signal (#4802, thanks @openprojects)

Version 2.3.3

Released on January 25, 2021

Security fixes

  • JSON locale data for invalid locales is no longer cached on disk; instead a 404 error is triggered. This avoids creating small files in the cache folder for each invalid locale that is requested. (#4766)


  • New translation: Ukrainian


  • Add a new “Until approved” option for a registration form’s “Modification allowed” setting (#4740, thanks @vasantvohra)

  • Show last login time in dashboard (#4735, thanks @vasantvohra)

  • Allow Markdown in the “Message for complete registrations” option of a registration form (#4741)

  • Improve video conference linking dropdown for contributions/sessions (hide unscheduled, show start time) (#4753)

  • Show timetable filter button in conferences with a meeting-like timetable


  • Fix error when converting malformed HTML links to LaTeX

  • Hide inactive contribution/abstract fields in submit/edit forms (#4755)

  • Fix adding registrants to a session ACL

Internal Changes

  • Videoconference plugins may now display a custom message for the prompt when deleting a videoconference room (#4733)

  • Videoconference plugins may now override the behavior when cloning an event with attached videoconference rooms (#4732)

Version 2.3.2

Released on November 30, 2020


  • Disable title field by default in new registration forms (#4688, #4692)

  • Add gender-neutral “Mx” title (#4688, #4692)

  • Add contributions placeholder for emails (#4716, thanks @bpedersen2)

  • Show program codes in contribution list (#4713)

  • Display the target URL of link materials if the user can access them (#2599, #4718)

  • Show the revision number for all revisions in the Editing timeline (#4708)


  • Only consider actual speakers in the “has registered speakers” contribution list filter (#4712, thanks @bpedersen2)

  • Correctly filter events in “Sync with your calendar” links (this fix only applies to newly generated links) (#4717)

  • Correctly grant access to attachments inside public sessions/contribs even if the event is more restricted (#4721)

  • Fix missing filename pattern check when suggesting files from Paper Peer Reviewing to submit for Editing (#4715)

  • Fix filename pattern check in Editing when a filename contains dots (#4715)

  • Require explicit admin override (or being whitelisted) to override blockings (#4706)

  • Clone custom abstract/contribution fields when cloning abstract settings (#4724, thanks @bpedersen2)

  • Fix error when rescheduling a survey that already has submissions (#4730)

Version 2.3.1

Released on October 27, 2020

Security fixes

  • Fix potential data leakage between OAuth-authenticated and unauthenticated HTTP API requests for the same resource (#4663)


Due to OAuth access to the HTTP API having been broken until this version, we do not believe this was actually exploitable on any Indico instance. In addition, only Indico administrators can create OAuth applications, so regardless of the bug there is no risk for any instance which does not have OAuth applications with the read:legacy_api scope.


  • Generate material packages in a background task to avoid timeouts or using excessive amounts of disk space in case of people submitting several times (#4630)

  • Add new EXPERIMENTAL_EDITING_SERVICE setting to enable extending an event’s Editing workflow through an OpenReferee server (#4659)


  • Only show the warning about draft mode in a conference if it actually has any contributions or timetable entries

  • Do not show incorrect modification deadline in abstract management area if no such deadline has been set (#4650)

  • Fix layout problem when minutes contain overly large embedded images (#4653, #4654)

  • Prevent pending registrations from being marked as checked-in (#4646, thanks @omegak)

  • Fix OAuth access to HTTP API (#4663)

  • Fix ICS export of events with draft timetable and contribution detail level (#4666)

  • Fix paper revision submission field being displayed for judges/reviewers (#4667)

  • Fix managers not being able to submit paper revisions on behalf of the user (#4667)

Internal Changes

  • Add registration_form_wtform_created signal and send form data in registration_created and registration_updated signals (#4642, thanks @omegak)

  • Add logged_in signal

Version 2.3

Released on September 14, 2020


We also published a blog post summarizing the most relevant changes for end users.

Major Features

  • Add category roles, which are similar to local groups but within the scope of a category and its subcategories. They can be used for assigning permissions in any of these categories and events within such categories.

  • Events marked as “Invisible” are now hidden from the category’s event list for everyone except managers (#4419, thanks @openprojects)

  • Introduce profile picture, which is for now only visible on the user dashboard (#4431, thanks @omegak)

  • Registrants can now be added to event ACLs. This can be used to easily restrict parts of an event to registered participants. If registration is open and a registration form is in the ACL, people will be able to access the registration form even if they would otherwise not have access to the event itself. It is also possible to restrict individual event materials and custom page/link menu items to registered participants. (#4477, #4528, #4505, #4507)

  • Add a new Editing module for papers, slides and posters which provides a workflow for having a team review the layout/formatting of such proceedings and then publish the final version on the page of the corresponding contribution. The Editing module can also be connected to an external microservice to handle more advanced workflows beyond what is supported natively by Indico.


  • New translation: Chinese (Simplified)


  • Sort survey list by title (#3802)

  • Hide “External IDs” field if none are defined (#3857)

  • Add LaTeX source export for book of abstracts (#4035, thanks @bpedersen2)

  • Tracks can now be categorized in track groups (#4052)

  • Program codes for sessions, session blocks, contributions and subcontributions can now be auto-generated (#4026)

  • Add draft mode for the contribution list of conference events which hides pages like the contribution list and timetable until the event organizers publish the contribution list. (#4095)

  • Add ICS export for information in the user dashboard (#4057)

  • Allow data syncing with multipass providers which do not support refreshing identity information

  • Show more verbose error when email validation fails during event registration (#4177)

  • Add link to external map in room details view (#4146)

  • Allow up to 9 digits (instead of 6) before the decimal point in registration fees

  • Add button to booking details modal to copy direct link (#4230)

  • Do not require new room manager approval when simply shortening a booking (#4214)

  • Make root category description/title customizable using the normal category settings form (#4231)

  • Added new LOCAL_GROUPS setting that can be used to fully disable local groups (#4260)

  • Log bulk event category changes in the event log (#4241)

  • Add CLI commands to block and unblock users (#3845)

  • Show warning when trying to merge a blocked user (#3845)

  • Allow importing event role members from a CSV file (#4301)

  • Allow optional comment when accepting a pre-booking (#4086)

  • Log event restores in event log (#4309)

  • Warn about cancelling/rejecting whole recurring bookings instead of just specific occurrences (#4092)

  • Add “quick cancel” link to room booking reminder emails (#4324)

  • Add visual information and filtering options for participants’ registration status to the contribution list (#4318)

  • Add warning when accepting a pre-booking in case there are concurrent bookings (#4129)

  • Add event logging to opening/closing registration forms, approval/rejection of registrations, and updates to event layout (#4360, thanks @giusedb & @omegak)

  • Add category navigation dialog on category display page (#4282, thanks @omegak)

  • Add UI for admins to block/unblock users (#3243)

  • Show labels indicating whether a user is an admin, blocked or soft-deleted (#4363)

  • Add map URL to events, allowing also to override room map URL (#4402, thanks @omegak)

  • Use custom time picker for time input fields taking into account the 12h/24h format of the user’s locale (#4399)

  • Refactor the room edit modal to a tabbed layout and improve error handling (#4408)

  • Preserve non-ascii characters in file names (#4465)

  • Allow resetting moderation state from registration management view (#4498, thanks @omegak)

  • Allow filtering event log by related entries (#4503, thanks @omegak)

  • Do not automatically show the browser’s print dialog in a meeting’s print view (#4513)

  • Add “Add myself” button to person list fields (e.g. for abstract authors) (#4411, thanks @jgrigera)

  • Subcontributions can now be managed from the meeting display view (#2679, #4520)

  • Add CfA setting to control whether authors can edit abstracts (#3431)

  • Add CfA setting to control whether only speakers or also authors should get submission rights once the abstract gets accepted (#3431)

  • Show the Indico version in the footer again (#4558)

  • Event managers can upload a custom Book of Abstract PDF (#3039, #4577)

  • Display each news item on a separate page instead of together with all the other news items (#4587)

  • Allow registrants to withdraw their application (#2715, #4585, thanks @brabemi & @omegak)

  • Allow choosing a default badge in categories (#4574, thanks @omegak)

  • Display event labels on the user’s dashboard as well (#4592)

  • Event modules can now be imported from another event (#4518, thanks @meluru)

  • Event modules can now be imported from another event (#4518, #4533, thanks @meluru)

  • Include the event keywords in the event API data (#4598, #4599, thanks @chernals)

  • Allow registrants to check details for non-active registrations and prevent them from registering twice with the same registration form (#4594, #4595, thanks @omegak)

  • Add a new CUSTOM_LANGUAGES setting to indico.conf to override the name/territory of a language or disable it altogether (#4620)


  • Hide Book of Abstracts menu item if LaTeX is disabled and no custom Book of Abstracts has been uploaded

  • Use a more consistent order when cloning the timetable (#4227)

  • Do not show unrelated rooms with similar names when booking room from an event (#4089)

  • Stop icons from overlapping in the datetime widget (#4342)

  • Fix alignment of materials in events (#4344)

  • Fix misleading wording in protection info message (#4410)

  • Allow guests to access public notes (#4436)

  • Allow width of weekly event overview table to adjust to window size (#4429)

  • Fix whitespace before punctuation in Book of Abstracts (#4604)

  • Fix empty entries in corresponding authors (#4604)

  • Actually prevent users from editing registrations if modification is disabled

  • Handle LaTeX images with broken redirects (#4623, thanks @bcc)

Internal Changes

  • Make React and SemanticUI usable everywhere (#3955)

  • Add before-regform template hook (#4171, thanks @giusedb)

  • Add registrations kwarg to the event.designer.print_badge_template signal (#4297, thanks @giusedb)

  • Add registration_form_edited signal (#4421, thanks @omegak)

  • Make PyIntEnum freeze enums in Alembic revisions (#4425, thanks @omegak)

  • Add before-registration-summary template hook (#4495, thanks @omegak)

  • Add extra-registration-actions template hook (#4500, thanks @omegak)

  • Add event-management-after-title template hook (#4504, thanks @meluru)

  • Save registration id in related event log entries (#4503, thanks @omegak)

  • Add before-registration-actions template hook (#4524, thanks @omegak)

  • Add LinkedDate and DateRange form field validators (#4535, thanks @omegak)

  • Add extra-regform-settings template hook (#4553, thanks @meluru)

  • Add filter_selectable_badges signal (#4557, thanks @omegak)

  • Add user ID in every log record logged in a request context (#4570, thanks @omegak)

  • Add extra-registration-settings template hook (#4596, thanks @meluru)

  • Allow extending polymorphic models in plugins (#4608, thanks @omegak)

  • Wrap registration form AngularJS directive in jinja block for more easily overriding arguments passed to the app in plugins (#4624, thanks @omegak)

Version 2.2.9



  • Fix error when building LaTeX PDFs if the temporary event logo path contained an underscore (#4521)

  • Disallow storing invalid timezones in user settings and reduce risk of sending wrong timezone names when people automatically translate their UI (#4529)

Version 2.2.8

Released on April 08, 2020

Security fixes

  • Update bleach to fix a regular expression denial of service vulnerability

  • Update Pillow to fix a buffer overflow vulnerability

Version 2.2.7

Released on March 23, 2020


  • Add support for event labels to indicate e.g. postponed or cancelled events (#3199)


  • Allow slashes in roomName export API

  • Show names instead of IDs of local groups in ACLs (#3700)

Version 2.2.6

Released on February 27, 2020


  • Fix some email fields (error report contact, agreement cc address) being required even though they should be optional

  • Avoid browsers prefilling stored passwords in togglable password fields such as the event access key

  • Make sure that tickets are not attached to emails sent to registrants for whom tickets are blocked (#4242)

  • Fix event access key prompt not showing when accessing an attachment link (#4255)

  • Include event title in OpenGraph metadata (#4288)

  • Fix error when viewing abstract with reviews that have no scores

  • Update requests and pin idna to avoid installing incompatible dependency versions (#4327)

Version 2.2.5

Released on December 06, 2019


  • Sort posters in timetable PDF export by board number (#4147, thanks @bpedersen2)

  • Use lat/lng field order instead of lng/lat when editing rooms (#4150, thanks @bpedersen2)

  • Add additional fields to the contribution csv/xlsx export (authors and board number) (#4148, thanks @bpedersen2)


  • Update the Pillow library to 6.2.1. This fixes an issue where some malformed images could result in high memory usage or slow processing.

  • Truncate long speaker names in the timetable instead of hiding them (#4110)

  • Fix an issue causing errors when using translations for languages with no plural forms (like Chinese).

  • Fix creating rooms without touching the longitude/latitude fields (#4115)

  • Fix error in HTTP API when Basic auth headers are present (#4123, thanks @uxmaster)

  • Fix incorrect font size in some room booking dropdowns (#4156)

  • Add missing email validation in some places (#4158)

  • Reject requests containing NUL bytes in the POST data (#4159)

  • Fix truncated timetable PDF when using “Print each session on a separate page” in an event where the last timetable entry of the day is a top-level contribution or break (#4134, thanks @bpedersen2)

  • Only show public contribution fields in PDF exports (#4165)

  • Allow single arrival/departure date in accommodation field (#4164, thanks @bpedersen2)

Version 2.2.4

Released on October 16, 2019

Security fixes

  • Fix more places where LaTeX input was not correctly sanitized. While the biggest security impact (reading local files) has already been mitigated when fixing the initial vulnerability in the previous release, it is still strongly recommended to update.

Version 2.2.3

Released on October 08, 2019

Security fixes

  • Strip @, +, - and = from the beginning of strings when exporting CSV files to avoid security issues when opening the CSV file in Excel

  • Use 027 instead of 000 umask when temporarily changing it to get the current umask

  • Fix LaTeX sanitization to prevent malicious users from running unsafe LaTeX commands through specially crafted abstracts or contribution descriptions, which could lead to the disclosure of local file contents


  • Improve room booking interface on small-screen devices (#4013)

  • Add user preference for room owners/manager to select if they want to receive notification emails for their rooms (#4096, #4098)

  • Show family name field first in user search dialog (#4099)

  • Make date headers clickable in room booking calendar (#4099)

  • Show times in room booking log entries (#4099)

  • Support disabling server-side LaTeX altogether and hide anything that requires it (such as contribution PDF export or the Book of Abstracts). LaTeX is now disabled by default, unless the XELATEX_PATH is explicitly set in indico.conf.


  • Remove 30s timeout from dropzone file uploads

  • Fix bug affecting room booking from an event in another timezone (#4072)

  • Fix error when commenting on papers (#4081)

  • Fix performance issue in conferences with public registration count and a high amount of registrations

  • Fix confirmation prompt when disabling conference menu customizations (#4085)

  • Fix incorrect days shown as weekend in room booking for some locales

  • Fix ACL entries referencing event roles from the old event when cloning an event with event roles in the ACL. Run indico maint fix-event-role-acls after updating to fix any affected ACLs (#4090)

  • Fix validation issues in coordinates fields when editing rooms (#4103)

Version 2.2.2

Released on August 23, 2019


  • Remove dependency on pyatom, which has vanished from PyPI

Version 2.2.1

Released on August 16, 2019


  • Make list of event room bookings sortable (#4022)

  • Log when a booking is split during editing (#4031)

  • Improve “Book” button in multi-day events (#4021)


  • Add missing slash to the template_prefix of the designer module

  • Always use HH:MM time format in book-from-event link

  • Fix timetable theme when set to “indico weeks view” before 2.2 (#4027)

  • Avoid flickering of booking edit details tooltip

  • Fix outdated browser check on iOS (#4033)

Version 2.2

Released on August 06, 2019

Major Changes

  • ⚠️ Drop support for Internet Explorer 11 and other outdated or discontinued browser versions. Indico shows a warning message when accessed using such a browser. The latest list of supported browsers can be found in the README on GitHub, but generally Indico now supports the last two versions of each major browser (determined at release time), plus the current Firefox ESR.

  • Rewrite the room booking frontend to be more straightforward and user-friendly. Check our blog for details.


  • Rework the event log viewer to be more responsive and not freeze the whole browser when there are thousands of log entries

  • Add shortcut to next upcoming event in a category (#3388)

  • Make registration period display less confusing (#3359)

  • Add edit button to custom conference pages (#3284)

  • Support markdown in survey questions (#3366)

  • Improve event list in case of long event titles (#3607, thanks @nop33)

  • Include event page title in the page’s <title> (#3285, thanks @bpedersen2)

  • Add option to include subcategories in upcoming events (#3449)

  • Allow event managers to override the name format used in the event (#2455)

  • Add option to not clone venue/room of an event

  • Show territory/country next to the language name (#3968)

  • Add more sorting options to book of abstracts (#3429, thanks @bpedersen2)

  • Add more formatting options to book of abstracts (#3335, thanks @bpedersen2)

  • Improve message when the call for abstracts is scheduled to open but hasn’t started yet

  • Make link color handling for LaTeX pdfs configurable (#3283, thanks @bpedersen2)

  • Preserve displayed order in contribution exports that do not apply any specific sorting (#4005)

  • Add author list button to list of papers (#3978)


  • Fix incorrect order of session blocks inside timetable (#2999)

  • Add missing email validation to contribution CSV import (#3568, thanks @Kush22)

  • Do not show border after last item in badge designer toolbar (#3607, thanks @nop33)

  • Correctly align centered footer links (#3599, thanks @nop33)

  • Fix top/right alignment of session bar in event display view (#3599, thanks @nop33)

  • Fix error when trying to create a user with a mixed-case email address in the admin area

  • Fix event import if a user in the exported data has multiple email addresses and they match different users

  • Fix paper reviewers getting notifications even if their type of reviewing has been disabled (#3852)

  • Correctly handle merging users in the paper reviewing module (#3895)

  • Show correct number of registrations in management area (#3935)

  • Fix sorting book of abstracts by board number (#3429, thanks @bpedersen2)

  • Enforce survey submission limit (#3256)

  • Do not show “Mark as paid” button and checkout link while a transaction is pending (#3361, thanks @driehle)

  • Fix 404 error on custom conference pages that do not have any ascii chars in the title (#3998)

  • Do not show pending registrants in public participant lists (#4017)

Internal Changes

  • Use webpack to build static assets

  • Add React+Redux for new frontend modules

  • Enable modern ES201x features

Version 2.1.11

Released on October 16, 2019

Security fixes

  • Fix more places where LaTeX input was not correctly sanitized. While the biggest security impact (reading local files) has already been mitigated when fixing the initial vulnerability in the previous release, it is still strongly recommended to update.

Version 2.1.10

Released on October 08, 2019

Security fixes

  • Strip @, +, - and = from the beginning of strings when exporting CSV files to avoid security issues when opening the CSV file in Excel

  • Use 027 instead of 000 umask when temporarily changing it to get the current umask

  • Fix LaTeX sanitization to prevent malicious users from running unsafe LaTeX commands through specially crafted abstracts or contribution descriptions, which could lead to the disclosure of local file contents

Version 2.1.9

Released on August 26, 2019


  • Fix bug in calendar view, due to timezones (#3903)

  • Remove dependency on pyatom, which has vanished from PyPI (#4045)

Version 2.1.8

Released on March 12, 2019


  • Add A6 to page size options (#3793)


  • Fix celery/redis dependency issue (#3809)

Version 2.1.7

Released on January 24, 2019


  • Add setting for the default contribution duration of an event (#3446)

  • Add option to copy abstract attachments to contributions when accepting them (#3732)


  • Really fix the oauthlib conflict (was still breaking in some cases)

Version 2.1.6

Released on January 15, 2019


  • Allow adding external users as speakers/chairpersons (#3562)

  • Allow adding external users to event ACLs (#3562)

  • Pin requests-oauthlib version to avoid dependency conflict

Version 2.1.5

Released on December 06, 2018


  • Render the reviewing state of papers in the same way as abstracts (#3665)


  • Use correct speaker name when exporting contributions to spreadsheets

  • Use friendly IDs in abstract attachment package folder names

  • Fix typo in material package subcontribution folder names

  • Fix check on whether registering for an event is possible

  • Show static text while editing registrations (#3682)

Version 2.1.4

Released on September 25, 2018


  • Let managers download tickets for registrants even if all public ticket downloads are disabled (#3493)

  • Do not count deleted registrations when printing tickets from the badge designer page

  • Hide “Save answers” in surveys while not logged in

  • Fix importing event archives containing registrations with attachments

  • Fix display issue in participants table after editing data (#3511)

  • Fix errors when booking rooms via API

Version 2.1.3

Released on August 09, 2018

Security fixes

  • Only return timetable entries for the current session when updating a session through the timetable (#3474, thanks @glunardi for reporting)

  • Prevent session managers/coordinators from modifying certain timetable entries or scheduling contributions not assigned to their session

  • Restrict access to timetable entry details to users who are authorized to see them


  • Improve survey result display (#3486)

  • Improve email validation for registrations (#3471)


  • Point to correct day in “edit session timetable” link (#3419)

  • Fix error when exporting abstracts with review questions to JSON

  • Point the timetable to correct day in the session details

  • Fix massive performance issue on the material package page in big events

  • Fix error when using the checkin app to mark someone as checked in (#3473, thanks @femtobit)

  • Fix error when a session coordinator tries changing the color of a break using the color picker in the balloon’s tooltip

Internal Changes

  • Add some new signals and template hooks to the registration module

Version 2.1.2

Released on June 11, 2018


  • Show email address for non-anonymous survey submissions (#3258)


  • Show question description in survey results (#3383)

  • Allow paper managers to submit paper revisions

  • Fix error when not providing a URL for privacy policy or terms

  • Use consistent order for privacy/terms links in the footer

  • Fix cloning of locked events

Version 2.1.1

Released on May 31, 2018


  • Add a privacy policy page linked from the footer (#1415)

  • Terms & Conditions can now link to an external URL

  • Show a warning to all admins if Celery is not running or outdated

  • Add registration ID placeholder for badges (#3370, thanks @bpedersen2)


  • Fix alignment issue in the “Indico Weeks View” timetable theme (#3367)

  • Reset visibility when cloning an event to a different category (#3372)

Version 2.1

Released on May 16, 2018

Major Features

  • Add event roles, which are similar to local groups but within the scope of an event. They can be used both for assigning permissions within the event and also for quickly seeing which user has which role (such as “Program Committee” in the event

  • Add new Participant Roles (previously called Roles) which now shows each person’s custom event roles and whether they have registered for the event in addition to the the default roles (speaker, chairperson, etc.)

  • Add visibility options to custom abstract/contribution fields so they can be restricted to be editable/visible only for event managers or authors/submitters instad of anyone who can see the abstract/contribution

  • Provide new interface to import registations/contributions from a CSV file (#3144)

  • Rework how access/permissions are managed. Now all access and management privileges can be assigned from a single place on the protection management page.


  • Allow specifying a default session for a track which will then be used by default when accepting an abstract in that track (#3069)

  • Allow marking contribution types as private so they cannot be selected by users submitting an abstract (#3138)

  • Add support for boolean (yes/no) and freetext questions in abstract reviewing (#3175)

  • Support event cloning with monthly recurrence on the last day of the month (#1580)

  • Add support for custom session types (#3189)

  • Move poster session flag from session settings to session type settings

  • Add contribution cloning within an event (#3207)

  • Add option to include the event description in reminder emails (#3157, thanks @bpedersen2)

  • Pin default themes to the top for event managers (#3166)

  • Add user setting whether to show future events or not by default in a category. Also keep the per-category status in the session (#3233, thanks @bpedersen2)

  • Keep page titles in sync with conference menu item titles (#3236)

  • Add option to hide an attachment folder in the display areas of an event (#3181, thanks @bpedersen2)

  • Improve flower redirect URI generation (#3187, thanks @bpedersen2)

  • When blocking a user account, the user will be forcefully logged out in addition to being prevented from logging in

  • Show track-related columns in abstract list only if there are tracks defined for the event (#2813)

  • Show warning box to inform that reviewer roles do not apply when an event has no tracks (#2919)

  • Allow specifying min/max length for registration form text fields (#3193, thanks @bpedersen2)

  • Add settings to configure the scale of ‘rating’ questions in paper reviewing

  • Show a nicer error message when entering an excessively high base registration fee (#3260)

  • Use proper British English for person titles (#3279)

  • Add event keywords in meta tags (#3262, thanks @bpedersen2)

  • Improve sorting by date fields in the registrant list

  • Use the user’s preferred name format in more places

  • Add “back to conference” link when viewing a conference timetable using a meeting theme (#3297, thanks @bpedersen2)

  • Allow definition lists in places where Markdown or HTML is accepted (#3325)

  • Include event date/time in registration emails (#3337)

  • Allow div/span/pre with classes when writing raw HTML in CKEditor (#3332, thanks @bpedersen2)

  • Sort abstract authors/speakers by last name (#3340)

  • Improve machine-readable metadata for events and categories (#3287, thanks @bpedersen2)


  • Fix selecting a person’s title in a different language than English

  • Fix display issue in “now happening” (#3278)

  • Fix error when displaying the value of an accommodation field in the registrant list and someone has the “no accomodation” option selected (#3272, thanks @bpedersen2)

  • Use the ‘Reviewing’ realm when logging actions from the abstract/paper reviewing modules

  • Fix error when printing badges/posters with empty static text fields (#3290)

  • Fix error when generating a PDF timetable including contribution abstracts (#3289)

  • Do not require management access to a category to select a badge template from it as a backside.

  • Fix breadcrumb metadata (#3321, thanks @bpedersen2)

  • Fix error when accessing certain registration pages without an active registration

  • Use event timezone when displaying event log entries (#3354)

  • Correctly render most markdown elements when generating a programme PDF (#3351)

  • Do not send any emails when trying to approve/reject a registration that is not pending (#3358)

Internal Changes

  • Rename Roles in ACL entries to Permissions. This especially affects the can_manage method whose role argument has been renamed to permission (#3057)

  • Add new registration_checkin_updated signal that can be used by plugins to perform an action when the checkin state of a registration changes (#3161, thanks @bpedersen2)

  • Add new signals that allow plugins to run custom code at the various stages of the RH execution and replace/modify the final response (#3227)

  • Add support for building plugin wheels with date/commit-suffixed version numbers (#3232, thanks @driehle)

Version 2.0.3

Released on March 15, 2018

Security fixes

  • Do not show contribution information (metadata including title, speakers and a partial description) in the contribution list unless the user has access to a contribution


  • Show more suitable message when a service request is auto-accepted (#3264)

Version 2.0.2

Released on March 07, 2018

Security fixes

  • Update bleach to fix an XSS vulnerability


  • Warn when editing a speaker/author would result in duplicate emails


  • Take ‘center’ orientation of badge/poster backgrounds into account (#3238, thanks @bpedersen2)

  • Fail nicely when trying to register a local account with an already-used email confirmation link (#3250)

Version 2.0.1

Released on February 6, 2018


  • Add support for admin-only designer placeholders. Such placeholders can be provided by custom plugins and only be used in the designer by Indico admins (#3210)

  • Sort contribution types alphabetically

  • Add folding indicators when printing foldable badges (#3216)


  • Fix LaTeX rendering issue when consecutive lines starting with [ were present (#3203)

  • Do not allow managers to retrieve tickets for registrants for whom ticket access is blocked by a plugin (#3208)

  • Log a warning instead of an exception if the Indico version check fails (#3209)

  • Wrap long lines in event log entries instead of truncating them

  • Properly show message about empty agenda in reminders that have “Include agenda” enabled but an empty timetable

  • Fix overly long contribution type names pushing edit/delete buttons outside the visible area (#3215)

  • Only apply plugin-imposed ticket download restrictions for tickets, not for normal badges.

  • Fix switching between badge sides in IE11 (#3214)

  • Do not show poster templates as possible backsides for badges

  • Convert alpha-channel transparency to white in PDF backgrounds

  • Make number inputs big enough to show 5 digits in chrome

  • Sort chairperson list on lecture pages

  • Remove whitespace before commas in speaker lists

  • Hide author UI for subcontribution speakers (#3222)

Version 2.0

Released on January 12, 2018


  • Add author_type and is_speaker fields for persons in the JSON abstract export

  • Add legacy redirect for


  • Fix unicode error when searching external users from the “Search Users” dialog

  • Fix missing event management menu/layout when creating a material package from the event management area

  • Fix error when viewing a contribution with co-authors

  • Fix sorting of registration form items not working anymore after moving/disabling some items

  • Fix error after updating from 2.0rc1 if there are cached Mako templates

  • Fix error when retrieving an image referenced in an abstract fails

  • Fix rendering of time pickers in recent Firefox versions (#3194)

  • Fix error when trying to use the html serializer with the timetable API

  • Fix error when receiving invalid payment events that should be ignored

  • Fix last occurrence not being created when cloning events (#3192)

  • Fix multiple links in the same line being replaced with the first one when converting abstracts/contributions to PDF (#2816)

  • Fix PDF generation when there are links with & in the URL

  • Fix incorrect spacing in abstract author/speaker lists (#3205)

Version 2.0rc2

Released on December 8, 2017


  • Allow changing the reloader used by the dev server (#3150)


  • Do not show borders above/below the message in registration emails unless both the header and body blocks are used (#3151)

  • Roll-back the database transaction when an error occurs.

  • Fix rendering of the LaTeX error box (#3163)

  • Fix “N/A” being displayed in a survey result if 0 is entered in a number field

  • Fix “N/A” not being displayed in a survey result if nothing is selected in a multi-choice select field

  • Fix error when using target_* placeholders in abstract notification emails for actions other than “Merged” (#3171)

  • Show full track title in tooltips on abstract pages

  • Show correct review indicators when a reviewer still has to review an abstract in a different track

  • Fix unicode error when searching external users in an LDAP backend

Internal Changes

  • Remove SCSS_DEBUG_INFO config option.

Version 2.0rc1

Released on November 10, 2017


  • Hide category field in event creation dialog if there are no subcategories (#3112)

  • Remove length limit from registration form field captions (#3119)

  • Use semicolons instead of commas as separator when exporting list values (such as multi-select registration form fields) to CSV or Excel (#3060)

  • Use custom site title in page title (#3018)

  • Allow manually entering dates in datetime fields (#3136)

  • Send emails through a celery task. This ensures users do not get an error if the mail server is temporarily unavailable. Sending an email is also retried for a while in case of failure. In case of a persistent failure the email is dumped to the temp directory and can be re-sent manually using the new indico resend_email command (#3121)

  • Reject requests containing NUL bytes in the query string (#3142)


  • Do not intercept HTTP exceptions containing a custom response. When raising such exceptions we do not want the default handling but rather send the custom response to the client.

  • Do not apply margin for empty root category sidebar (#3116, thanks @nop33)

  • Fix alignment of info-grid items on main conference page (#3126)

  • Properly align the label of the attachment folder title field

  • Fix some rare unicode errors during exception handling/logging

  • Clarify messages in session block rescheduling dialogs (#3080)

  • Fix event header bar in IE11 (#3135)

  • Fix footer on login page (#3132)

  • Use correct module name for abstract notification emails in the event log

  • Remove linebreaks from email subject in paper review notifications

  • Fix extra padding in the CFA roles dialog (#3129)

  • Do not show an extra day in timetable management if an event begins before a DST change

  • Disable caching when retrieving the list of unscheduled contributions

  • Process placeholders in the subject when emailing registrants

  • Fix Shibboleth login with non-ascii names (#3143)

Internal Changes

  • Add new is_ticket_blocked signal that can be used by plugins to disable ticket downloads for a registration.

Version 2.0a1

Released on October 20, 2017

This is the first release of the 2.0 series, which is an almost complete rewrite of Indico based on a modern software stack and PostgreSQL.