Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin
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 ser…
Severity medium: primary CNA CVSS 4.8 v4.0 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-10-29T01:32:09.466Z. Updated 2026-10-29T02:02:13.700Z.