CVE-2026-33710 Details
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.
A vulnerability exists in Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3, where REST API keys are generated using a predictable formula that can be exploited. The method combines the current timestamp, user ID, and a random number that is not truly random, as it always returns the same value. This predictability allows an attacker who knows a username and the approximate time the key was created to brute-force the API key. The vulnerability is particularly concerning because it can lead to unauthorized access and privilege escalation.
Users can update to Chamilo LMS versions 1.11.38 or 2.0.0-RC.3, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-330 | Use of Insufficiently Random Values | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| chamilo chamilo lms | < 1.11.38 2.0.0 alpha1 2.0.0 alpha2 2.0.0 alpha3 2.0.0 alpha4 2.0.0 alpha5 2.0.0 beta1 2.0.0 beta2 2.0.0 beta3 2.0.0 rc1 2.0.0 rc2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 16, 2026 | Initial Analysis | [email protected] |
| Apr 10, 2026 | New CVE Received | [email protected] |