What’s Vulnerable › Vulnerabilities

CVE-2026-82535: Chamilo LMS Stored XSS via Survey Answer Submission in reporting.php

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-09-24
• Weakness: CWE-79

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.

Affected products

• chamilo-lms: from 1.11.0 through 1.11.40; from 2.0.0 through 2.0.3

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

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