CVE-2026-82535
Description
Chamilo LMS before 1.11.42 and 3.0.0 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious script payloads into survey answers by computing deterministic invitation codes and bypassing authorization checks in the survey submission endpoint. Attackers can submit crafted answers containing unescaped HTML rendered in reporting views to execute arbitrary scripts in the browser sessions of teachers or administrators, enabling persistent backdoor account creation by exploiting the victim's authenticated session.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://github.com/chamilo/chamilo-lms/commit/be45f2f2a29319afbbf9ce27d094698911799d10
- https://github.com/chamilo/chamilo-lms/commit/bea9cbcfc6ca58f387c6c25bef2f15dc5df9d147
- https://github.com/chamilo/chamilo-lms/commit/c9d2614d798571b94cef1cb61e605a2fc89f0386
- https://github.com/chamilo/chamilo-lms/releases/tag/v3.0.0
- https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-m3wr-p8wj-jmf6
- https://www.vulncheck.com/advisories/chamilo-lms-stored-xss-via-survey-answer-submission-in-reporting-php
CWEs
CWE-79
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.