What is CVE-2026-33736?

CVE-2026-33736 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-2026-33736?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Chamilo Chamilo-Lms

CVE-2026-33736

Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, any authenticated user (including ROLE_STUDENT) can enumerate all platform users and access personal information (email, phone, roles) via GET /api/users, including administrator accounts. This vulnerability is fixed in 2.0.0-RC.3.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-04-10 · last modified 2026-06-17.

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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.5% 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: +0.001

Affected products

Chamilo Chamilo-Lms — versions >= 2.0.0-alpha.1, < 2.0.0-RC.3
Chamilo Lms — versions 2.0.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/chamilo/chamilo-lms/security/advisories/GHSA-fp2p-fj6c-x3x9 (Vendor Advisory)
github.com/chamilo/chamilo-lms/commit/1739371ce1c562c007c7f5d53e6d65b7a4ff4109 (Patch)

Frequently asked questions

What is CVE-2026-33736?: CVE-2026-33736 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-2026-33736?: Medium severity. CVSS v3 base score is 6.5 out of 10.