Cross-site scripting in Chamilo LMS - CVE-2026-39878
Published: July 7, 2026
Vulnerability identifier: #VU137022
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-39878
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript in an administrator's browser session and take over an administrator account.
The vulnerability exists due to cross-site scripting in the user registration form and user list page when processing user-supplied registration data and rendering it in HTML attributes. A remote attacker can submit crafted registration fields to execute arbitrary JavaScript in an administrator's browser session and take over an administrator account.
Self-registration must be enabled, and exploitation is triggered when an administrator visits the user list.
Affected software
Chamilo LMS
How to mitigate CVE-2026-39878
Install security update from vendor's website.
Chamilo LMS - update to 1.11.40