CVE-2026-33710: Chamilo Lms

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Chamilo Chamilo Lms: before 1.11.38 (fixed in 1.11.38); version 2.0.0 only

Published 2026-04-10. Last modified 2026-06-17.