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TI-2026-20807 Aliases CVE-2026-25739GHSA-jxc4-54g3-j7vp

Indico affected by Cross-Site-Scripting via material uploads

Priority LOW 24CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00193 9th percentileScored 2026-11-07
Fix Fixed indico (indico): 3.3.10indico (PyPI): 3.3.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
indicoindicobefore 3.3.103.3.10Patch availableCNA
—indico (PyPI)before 3.3.103.3.10Patch availableGHSA-jxc4-54g3-j7vp
  • indico Vendorindico Affected before 3.3.10 Fixed in 3.3.10 Patch available CNA
  • indico (PyPI) Vendor— Affected before 3.3.10 Fixed in 3.3.10 Patch available GHSA-jxc4-54g3-j7vp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cern:indico:*:*:*:*:*:*:*:*before 3.3.10Vulnerableindico
  • cpe:2.3:a:cern:indico:*:*:*:*:*:*:*:* Versions before 3.3.10 Vulnerable ·indico

Remediation

  • Fix · CNA indico (indico) Fixed in 3.3.10
  • Fix · GHSA-jxc4-54g3-j7vp indico (PyPI) Fixed in 3.3.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25739
  2. 2026-10-03 Alias added: GHSA-jxc4-54g3-j7vp

References

Patch 1

Advisory 1

Other 2

  • TI-2024-34052 Authorization bypass in Indico CVSS 3.1HIGH 7.5
  • TI-2026-25492 Indico discloses local files resulting in Remote Code Execution through LaTeX injection CVSS 4.0HIGH 7.7
  • TI-2026-20806 Indico has Server-Side Request Forgery (SSRF) in multiple places CVSS 4.0MEDIUM 6.9
  • TI-2026-22632 Indico missing access check in event series management API CVSS 3.1MEDIUM 6.5
  • TI-2021-10724 CERN Indico before 2.3.4 can use an attacker-supplied Host header in a password reset link. CVSS 3.1HIGH 7.5
  • TI-2024-30448 Indico has a Cross-Site-Scripting during account creation CVSS 3.1MEDIUM 6.1
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences