Vulnerability · Published Feb 19, 2026 · Assigned by GitHub_M
CVE-2026-25739Indico affected by Cross-Site-Scripting via material uploads
Medium 5.4
In plain English
A medium-severity cross-site scripting in indico from indico. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | indico | 3.3.10 | GHSA-jxc4-54g3-j7vp |
| PyPI | indico | 3.3.10 | PYSEC-2026-2182 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/indico/indico/security/advisories/GHSA-jxc4-54g3-j7vp x_refsource_CONFIRM
- https://github.com/indico/indico/releases/tag/v3.3.10 x_refsource_MISC