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Chamilo Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-34161 - Vulnerability Database
Chamilo

Chamilo Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability - CVE-2026-34161

Medium
Reference: CVE-2026-34161
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-34161
Title: Chamilo Improper Neutralization of Input During Web Page Generation (Cross-site Scripting) Vulnerability
Overview:

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3 a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality where an authenticated user can upload a malicious HTML file containing JavaScript via the /api/social_post_attachments endpoint. The uploaded file is served back from the application at the generated contentUrl without sanitization content type restrictions or a Content-Disposition: attachment header causing the JavaScript to execute in the browser within the application39s origin. Because the payload is stored server-side and runs in the trusted origin an attacker can perform session hijacking account takeover privilege escalation (if an admin views the link) and arbitrary actions on behalf of the victim. This issue has been fixed in version 2.0.0-RC.3.