CVE-2026-33707 chamilo CVE debrief

Who should care

Defenders responsible for Chamilo LMS installations, security teams, and vulnerability management teams should assess exposure and prioritize patching to prevent unauthorized password resets. Operators and administrators of Chamilo LMS should also be aware of the vulnerability and its potential impact on their systems.

Why it matters

CVE-2026-33707 is a critical vulnerability in Chamilo LMS that allows an attacker to change a user's password without authentication, potentially leading to unauthorized access to sensitive information. Defenders responsible for Chamilo LMS installations should assess exposure and prioritize patching to prevent unauthorized password resets.

• An attacker can change a user's password without authentication, potentially leading to unauthorized access to sensitive information
• Defenders need to verify if their Chamilo LMS installations are vulnerable and prioritize patching
• The vulnerability allows for exploitation without requiring authentication or other prerequisites

Technical summary

The default password reset mechanism in Chamilo LMS generates tokens using sha1($email) with no random component, no expiration, and no rate limiting. This allows an attacker who knows a user's email to compute the reset token and change the victim's password without authentication. The vulnerability is fixed in versions 1.11.38 and 2.0.0-RC.3. Defenders should prioritize patching vulnerable Chamilo LMS installations to prevent unauthorized password resets and implement additional security measures such as rate limiting and token expiration for password reset mechanisms.

Defensive priority

Defenders should prioritize patching vulnerable Chamilo LMS installations to prevent unauthorized password resets.

Recommended defensive actions

• Patch vulnerable Chamilo LMS installations to prevent unauthorized password resets
• Implement additional security measures such as rate limiting and token expiration for password reset mechanisms
• Monitor for suspicious password reset attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, its impact, and the fixed versions. Defenders should verify if their Chamilo LMS installations are vulnerable and prioritize patching to prevent unauthorized password resets. The default password reset mechanism in Chamilo LMS generates tokens using sha1($email) with no random component, no expiration, and no rate limiting. This allows an attacker who knows a user's email to compute the reset token and change the victim's password without authenticat

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.