CVE-2026-31940 chamilo CVE debrief

Who should care

Defenders responsible for Chamilo LMS installations should assess exposure and apply patches if necessary. This includes reviewing and updating inventory of Chamilo LMS installations, monitoring for potential session fixation attempts, and updating incident response plans to include procedures for handling session fixation attacks. Additionally, defenders should prioritize verifying exposure and applying patches for Chamilo LMS versions prior to 1.11.38 2.

Why it matters

The Chamilo LMS session fixation vulnerability requires defenders to verify exposure, apply patches, and monitor for potential attacks. This vulnerability affects versions prior to 1.11.38 and 2.0.0-RC.3, and defenders should prioritize patching and monitoring.

• Verify Chamilo LMS version and apply patches if necessary to prevent session fixation
• Review and update inventory of Chamilo LMS installations to ensure accurate tracking
• Monitor for potential session fixation attempts to detect possible exploitation
• Update incident response plans to include procedures for handling session fixation attacks

Technical summary

The Chamilo LMS is vulnerable to session fixation due to user-controlled request parameters being used to set the PHP session ID before loading global bootstrap. This issue affects versions prior to 1.11.38 and 2.0.0-RC.3. The vulnerability allows attackers to fixate a user's session, potentially leading to unauthorized access. The vulnerability is caused by a lack of proper session management in the affected versions of Chamilo LMS. Defenders should prioritize verifying exposure and applying patches for Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3.

Recommended defensive actions

• Verify Chamilo LMS version and apply patches if necessary
• Review and update inventory of Chamilo LMS installations
• Monitor for potential session fixation attempts
• Implement additional security measures such as session ID regeneration
• Review and update incident response plans to include procedures for handling session fixation attacks
• Conduct regular security audits to detect potential vulnerabilities
• Update asset inventory to ensure accurate tracking of Chamilo LMS installations

Evidence notes

The CVE record and NVD entry provide details on the session fixation vulnerability in Chamilo LMS. Patches are available in versions 1.11.38 and 2.0.0-RC.3. The vulnerability is caused by user-controlled request parameters being used to set the PHP session ID before loading global bootstrap. This issue affects versions prior to 1.11.38 and 2.0.0-RC.3. Defenders should verify exposure and apply patches if necessary.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.