CVE-2026-39878

CRITICAL

Chamilo stored XSS via user registration leads to admin account takeover

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 9.3
EPSS 0.0024
EPSS Percentile 14.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
chamilo/chamilo-lms <= 1.11.38
Published Jul 20, 2026
Tracked Since Jul 20, 2026