CVE-2026-39878 PUBLISHED

Chamilo stored XSS via user registration leads to admin account takeover

Assigner: GitHub_M
Reserved: 07.04.2026 Published: 20.07.2026 Updated: 20.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS Score: 9.3

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	chamilo
Product	chamilo-lms
Versions	Version <= 1.11.38 is affected

References

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-gcjp-f7jm-rrrg

Problem Types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE