Improper Authorization in Chamilo LMS - CVE-2026-61566
Published: November 9, 2026
Vulnerability identifier: #VU163207
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-61566
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a low-privileged authenticated attacker to forge attendance records and delete teacher corrections in courses they do not belong to.
The vulnerability exists due to missing course-level authorization in Chamilo LMS AttendanceController and StudentPublicationController when processing requests containing user-controlled course, attendance, or assignment identifiers. A low-privileged authenticated attacker can change these identifiers to access other courses' student rosters, signatures, and assignment submissions without enrollment or teacher privileges.
Affected software
Chamilo LMS
How to mitigate CVE-2026-61566
Install security update from vendor's website.
Chamilo LMS - update to 3.0.0