Authorization bypass through user-controlled key in Chamilo LMS - CVE-2026-61733
Published: August 4, 2026
Vulnerability identifier: #VU140927
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-61733
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to authorization bypass through a user-controlled key in /api/usergroups/{id}/members when handling requests with a user-supplied group id. A remote user can iterate numeric group identifiers to disclose sensitive information.
Private and closed groups, administrative classes, and cross-portal group rosters may be exposed.
Affected software
Chamilo LMS
How to mitigate CVE-2026-61733
Install security update from vendor's website.
Chamilo LMS - update to 2.0.3