Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Prior to 3.3.13, the previous fix for CVE-2026-25738 did not cover an edge case, allowing an event organizer to submit a crafted URL that points to a prohibited local target but is accepted as valid by Indico. The organizer can read data returned by the target through affected Indico features.
This issue is fixed in version 3.3.13.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
indico:indico
References 4
https://github.com/indico/indico/security/advisories/GHSA-2v95-h47v-g4x9
https://github.com/indico/indico/security/advisories/GHSA-2v95-h47v-g4x9
https://github.com/indico/indico/pull/7573
https://github.com/indico/indico/pull/7573
https://github.com/indico/indico/commit/44540e70ab4e20a12f14ddba5218a33749a86736
https://github.com/indico/indico/commit/44540e70ab4e20a12f14ddba5218a33749a86736
https://github.com/indico/indico/releases/tag/v3.3.13
https://github.com/indico/indico/releases/tag/v3.3.13