Authorization bypass through user-controlled key in Chamilo LMS - CVE-2026-33703
Published: April 24, 2026
Vulnerability identifier: #VU127559
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-33703
CWE-ID: CWE-639
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 disclose sensitive information.
The vulnerability exists due to improper access control in the /social-network/personal-data/{userId} endpoint when handling requests with a modified userId parameter. A remote user can send a crafted request with an arbitrary userId to disclose sensitive information.
The issue exposes personal data and API tokens of arbitrary users, including administrator accounts.
How to mitigate CVE-2026-33703
Install security update from vendor's website.