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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/chamilo/chamilo-lms/commit/be45f2f2a29319afbbf9ce27d09469891…
disclosure@vulncheck.com
https://github.com/chamilo/chamilo-lms/commit/bea9cbcfc6ca58f387c6c25bef2f15dc5…
disclosure@vulncheck.com
https://github.com/chamilo/chamilo-lms/commit/c9d2614d798571b94cef1cb61e605a2fc…
disclosure@vulncheck.com
https://github.com/chamilo/chamilo-lms/releases/tag/v3.0.0
disclosure@vulncheck.com
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-m3wr-p8wj-jmf6
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/chamilo-lms-stored-xss-via-survey-answer-s…
disclosure@vulncheck.com