Vulnerability Description
In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived from the supplied filename. A user holding the EDIT_SYSTEM_SETTINGS permission can upload an HTML file that is then served as text/html from the openEQUELLA origin, resulting in stored cross-site scripting. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or everyone.
Related Weaknesses (CWE)
References
- https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj
- https://openequella.github.io/guides/
FAQ
What is CVE-2026-16889?
CVE-2026-16889 is a documented vulnerability. In openEQUELLA before 2026.1, the pre-login notice image upload endpoint (PUT /api/preloginnotice/image/{name}) does not validate the type of uploaded files and serves them with a Content-Type derived...
How severe is CVE-2026-16889?
CVSS scoring is not yet available for CVE-2026-16889. Check NVD for updates.
Is there a patch for CVE-2026-16889?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.