Indico Affected by Cross-Site-Scripting via material uploads
Impact
There is a Cross-Site-Scripting vulnerability when uploading certain file types as materials.
Patches
You should to update to Indico 3.3.10 as soon as possible. See the docs for instructions on how to update.
Please be aware that to apply the fix itself updating is sufficient, but to benefit from the strict Content-Security-Policy we now apply by default for file downloads, you need to update your webserver config in case you use nginx with Indico's STATIC_FILE_METHOD set to xaccelredirect and add the following line to the .xsf/indico/ location block (you can consult the Indico setup documentation for the full configuration snippet):
add_header Content-Security-Policy $upstream_http_content_security_policy;Workarounds
- Use your webserver config to apply a strict CSP for material download endpoints.
- Only let trustworthy users create content (including material uploads, which speakers can typically do as well) on Indico.
For more information
If you have any questions or comments about this advisory:
- Open a thread in our forum
- Email us privately at indico-team@cern.ch
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | indico | < 3.3.10 | 3.3.10 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
indico- Disclosed
- 17.02.2026
- Updated
- 11.10.2026 14:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2182 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-jxc4-54g3-j7vp - CC BY 4.0
Vulnerability history: indico
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 16
- First → latest
- 10.2019 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 3
- Medium 13
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 1
- 2022: 0
- 2023: 1
- 2024: 1
- 2025: 4
- 2026: 8
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Indico Affected by Cross-Site-Scripting via material uploads this entry
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