Auth bypass in Chamilo Chamilo-Lms
CVE-2026-33702
Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, Chamilo LMS contains an Insecure Direct Object Reference (IDOR) vulnerability in the Learning Path progress saving endpoint. The file lp_ajax_save_item.php accepts a uid (user ID) parameter directly from $_REQUEST and uses it to load and modify another user's Learning Path progress — including score, status, completion, and time — without verifying that the requesting user matches the target user ID. Any authenticated user enrolled in a course can overwrite another user's Learning Path progress by simply changing the uid parameter in the request. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (34.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
- Chamilo Chamilo-Lms — versions < 1.11.38, >= 2.0.0-alpha.1, < 2.0.0-RC.3
- Chamilo Lms — versions 2.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-33702?
- CVE-2026-33702 is a high-severity vulnerability in Chamilo Chamilo-Lms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-04-10.
- How severe is CVE-2026-33702?
- High severity. CVSS v3 base score is 7.1 out of 10.