Auth bypass in Chamilo Chamilo-Lms
CVE-2026-33703
Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, an Insecure Direct Object Reference (IDOR) vulnerability in the /social-network/personal-data/{userId} endpoint allows any authenticated user to access full personal data and API tokens of arbitrary users by modifying the userId parameter. This results in mass disclosure of sensitive user information and credentials, enabling a full platform data breach. This vulnerability is fixed in 2.0.0-RC.3.
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.002 (7.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Chamilo Chamilo-lms — versions < 2.0.0-RC.3
- Chamilo Chamilo_lms — versions 2.0.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-33703?
- CVE-2026-33703 is a medium-severity vulnerability in Chamilo Chamilo-Lms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-10.
- How severe is CVE-2026-33703?
- Medium severity. CVSS v3 base score is 6.5 out of 10.