CVE-2026-39878CWE-79cross-site-scripting

CVE-2026-39878

Critical · published July 20, 2026

CVSS v3.1
9.3
EPSS
0%
Percentile
36.7
In the wild
Unconfirmed
What it is

Chamilo LMS versions 1.11.38 and earlier contain a stored cross-site scripting vulnerability in the user registration form that allows any unauthenticated attacker to execute arbitrary JavaScript in an administrator's browser session, leading to full platform admin account takeover. This has been patched in 1.11.40.

The record
Technical detail
CVSS v3.1
9.3 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00435 · 36.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-20T22:16Z
References (2)
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-gcjp-f7jm-rrrg · [email protected]https://vokecyber.com/research/cve-2026-39878-chamilo-lms-stored-xss · [email protected]
EPSS history
Timeline
  • 20 JUL 17:08Z
    Chamilo stored XSS via user registration leads to admin account takeover
    cvelistv5