CVE-2026-28352: Indico missing access check in event series management API
Impact The API endpoint used to manage event series is missing an access check, allowing unauthenticated/unauthorized access to this endpoint.
The impact of this is limited to:
- Getting the metadata (title, category chain, start/end date) for events in an existing series - Deleting an existing event series: This just removes the series metadata, ie (if enabled) the links between events in the same series and the lecture series number in the event title - Modifying an existing event series: Just like for deleting, it would only allow to toggle the metadata display. It could also be used to set an event title pattern for the series, but this is only used when cloning an event from that series.
That this vulnerability does NOT allow unauthorized access to events (beyond the basic metadata mentioned above), nor any kind of tampering with user-visible data in events.
Patches Developers should to update to Indico 3.3.11 as soon as possible. See the docs for instructions on how to update.
Workarounds - Developers can configure their webserver to restrict access to the series management API endpoint
For more information If there are any questions or comments about this advisory:
- Open a thread in our forum - Email Indico privately at indico-team@cern.ch
Other sources
Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. In versions prior to 3.3.11, the API endpoint used to manage event series is missing an access check, allowing unauthenticated/unauthorized access to this endpoint. The impact of this is limited to getting the metadata (title, category chain, start/end date) for events in an existing series, deleting an existing event series, and modifying an existing event series. This vulnerability does NOT allow unauthorized access to events (beyond the basic metadata mentioned above), nor any kind of tampering with user-visible data in events. Version 3.3.11 fixes the issue. As a workaround, use the webserver to restrict access to the series management API endpoint.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-28352?
CVE-2026-28352 has a medium severity rating due to the potential for unauthorized access to event series management without proper authentication.
How do I fix CVE-2026-28352?
To fix CVE-2026-28352, upgrade Indico to version 3.3.11 or later, where the access check issue has been resolved.
What versions of Indico are affected by CVE-2026-28352?
Indico versions prior to 3.3.11 are affected by CVE-2026-28352.
What kind of vulnerability is CVE-2026-28352?
CVE-2026-28352 is a missing access control vulnerability in the event series management API.
Can CVE-2026-28352 be exploited by unauthenticated users?
Yes, CVE-2026-28352 can be exploited by unauthenticated users due to the lack of access checks in the API.