What is CVE-2026-25739?

CVE-2026-25739 is a medium-severity vulnerability in Cern Indico, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-19.

How severe is CVE-2026-25739?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Cern Indico

CVE-2026-25739

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 u…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (5.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Cern Indico
Indico — versions < 3.3.10

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-25739?: CVE-2026-25739 is a medium-severity vulnerability in Cern Indico, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-19.
How severe is CVE-2026-25739?: Medium severity. CVSS v3 base score is 5.4 out of 10.