CVE-2026-16889
CVE-2026-16889 · Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 4.8 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Affected products and versions
openequella
- Versions
- ≥ 2019.1, < 2026.1: Affected (custom)
Update to 2026.1