CVE-2026-82535
Chamilo LMS Stored XSS via Survey Answer Submission in reporting.php
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | chamilo |
| Product | chamilo-lms |
| Published | Sep 11, 2026 |
| Last Updated | Sep 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
chamilo / chamilo-lms
1.11.0 ≤ 1.11.40 2.0.0 ≤ 2.0.3
References
github.com: https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-m3wr-p8wj-jmf6 github.com: https://github.com/chamilo/chamilo-lms/releases/tag/v3.0.0 github.com: https://github.com/chamilo/chamilo-lms/commit/be45f2f2a29319afbbf9ce27d094698911799d10 github.com: https://github.com/chamilo/chamilo-lms/commit/c9d2614d798571b94cef1cb61e605a2fc89f0386 github.com: https://github.com/chamilo/chamilo-lms/commit/bea9cbcfc6ca58f387c6c25bef2f15dc5df9d147 vulncheck.com: https://www.vulncheck.com/advisories/chamilo-lms-stored-xss-via-survey-answer-submission-in-reporting-php
Credits
Jon Bytyqi Leon Bytyci VulnCheck