MEDIUM 4.8 NVD
CVE-2026-16889
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
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.
References
- https://github.com/openequella/openEQUELLA/security/advisories/GHSA-q2xv-rffq-mj5w
- https://openequella.github.io/guides/
This medium severity vulnerability with a CVSS score of 4.8 was published on 2026-10-29 via NVD.
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