CVE-2026-25739

The record

Indico is an event management system that uses Flask-Multipass, a multi-backend authentication system for Flask. Versions prior to 3.3.10 are vulnerable to cross-site scripting when uploading certain file types as materials. Users should upgrade to version 3.3.10 to receive a patch. To apply the fix itself updating is sufficient, but to benefit from the strict Content Security Policy (CSP) Indico now applies by default for file downloads, update the webserver config in case one uses nginx with Indico's `STATIC_FILE_METHOD` set to `xaccelredirect`. For further directions, consult the GitHub Security advisory or Indico setup documentation. Some workarounds are available. Use the webserver config to apply a strict CSP for material download endpoints, and/or only let trustworthy users create content (including material uploads, which speakers can typically do as well) on Indico.

Affected packages

Related vulnerabilities

• GHSA-jxc4-54g3-j7vp Indico Affected by Cross-Site-Scripting via material uploads Same vulnerability
• GHSA-rfpp-2hgm-gp5v Indico has a missing access check in the event series management API Also affects indico
• CVE-2026-28352 Indico is an event management system that uses Flask-Multipass, a multi-backend… Also affects indico
• CVE-2026-25738 Indico is an event management system that uses Flask-Multipass, a multi-backend… Also affects indico
• GHSA-f47c-3c5w-v7p4 Indico has Server-Side Request Forgery (SSRF) in multiple places Also affects indico
• CVE-2026-96379 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
• CVE-2026-96382 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79
• CVE-2026-96368 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")… CWE-79