cvedb.io
CVE-2026-34161
MEDIUM · CVSS 5.4
EPSS exploitation probability: 0%
Published 2026-04-14T21:16:26.400 · Last modified 2026-06-17T10:38:35.410

Summary

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 application's 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 b

Affected products

chamilo — chamilo_lms

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.