CVE-2026-82535
Chamilo LMS Stored XSS via Survey Answer Submission in reporting.php
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 11, 2026
- Updated
- Oct 1, 2026
- Reserved
- Aug 29, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
chamilo-lmschamilo |
|
References
- GitHub Security Advisory (GHSA-m3wr-p8wj-jmf6)vendor-advisory
- Chamilo LMS v3.0.0 Release Notesrelease-notes
- Patch Commit (3.0.x)patch
- Patch Commit (1.11.x)patch
- Patch Commit (1.11.x)patch
- https://www.vulncheck.com/advisories/chamilo-lms-stored-xss-via-survey-answer-submission-in-reporting-phpthird-party-advisory
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