Cross-site scripting in Chamilo LMS - CVE-2026-39878

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Main Vulnerability Database Vulnerabilities #VU137022

Cross-site scripting in Chamilo LMS - CVE-2026-39878

Published: July 7, 2026


Vulnerability identifier: #VU137022
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-39878
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Chamilo
Affected software:
Chamilo LMS

Detailed vulnerability description

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.


How to mitigate CVE-2026-39878

Install security update from vendor's website.

Sources