CVE-2026-33710CWE-330

Chamilo LMS has Weak REST API Key Generation (Predictable)

High · published April 10, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
41.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00492 · 41.3th percentile
Weakness
CWE-330 · Use of Insufficiently Random Values
Published
2026-04-10T18:59Z
EPSS history
Timeline
  • 10 APR 18:59Z
    Chamilo LMS has Weak REST API Key Generation (Predictable)
    cvelistv5