CVSS 3.1 Score 9.8 of 10 (high)


Published Nov 28, 2023
Updated: Dec 5, 2023


CVE-2023-3533 is a vulnerability that affects Chamilo LMS version 1.11.20 and earlier. It allows unauthenticated attackers to perform stored cross-site scripting attacks and execute remote code by exploiting a path traversal flaw in the file upload functionality of `/main/webservices/additional_webservices.php`. The vulnerability has a base severity rating of CRITICAL, with a base score of 9.8 out of 10. It poses a high risk to organizations as it can lead to unauthorized access, compromise of sensitive data, and potential manipulation or deletion of files. To remediate the vulnerability, users should update their Chamilo LMS installation to a patched version that addresses the path traversal issue.


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