Cross-site scripting in Chamilo LMS - CVE-2026-55503
Published: July 7, 2026
Vulnerability identifier: #VU137020
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55503
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Chamilo
Affected software:
Chamilo LMS
Chamilo LMS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary script in a victim's browser.
The vulnerability exists due to cross-site scripting in the learning path SCORM table of contents renderer when processing a crafted SCORM package item title. A remote user can upload a specially crafted SCORM package to execute arbitrary script in a victim's browser.
User interaction is required when a victim views the learning path, and the vulnerable rendering path is exposed when the AI disclosure feature is disabled.
How to mitigate CVE-2026-55503
Install security update from vendor's website.