CVE-2026-33710

HIGH

Chamilo LMS has Weak REST API Key Generation (Predictable)

Title source: cna

Description

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, REST API keys are generated using md5(time() + (user_id * 5) - rand(10000, 10000)). The rand(10000, 10000) call always returns exactly 10000 (min == max), making the formula effectively md5(timestamp + user_id*5 - 10000). An attacker who knows a username and approximate key creation time can brute-force the API key. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

References (3)

[X_Refsource_Confirm] https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-rpmg-j327-mr39

[X_Refsource_Misc] https://github.com/chamilo/chamilo-lms/commit/4448701bb8ec557e94ef02d19c72cbe9c49c2d09

[X_Refsource_Misc] https://github.com/chamilo/chamilo-lms/commit/e7400dd840586ae134b286d0a2374f3d269a9a9d

View Writeup ZIP pw:eip

Scores

CVSS v3 7.5

EPSS 0.0004

EPSS Percentile 12.4%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE

CWE-330

Status published

Products (4)

chamilo/chamilo-lms < 1.11.38

chamilo/chamilo-lms >= 2.0.0-alpha.1, < 2.0.0-RC.3

chamilo/chamilo_lms 2.0.0 alpha1 (10 CPE variants)

chamilo/chamilo_lms < 1.11.38

Published Apr 10, 2026

Tracked Since Apr 11, 2026