CVE-2026-16889Published

Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin

Exact source revision recorded 29 Oct 2026 03:25:09 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-16889

Published

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.

Source published: 29 Oct 2026 01:32:09 UTC
Source modified: 29 Oct 2026 01:32:09 UTC
Observed here: 29 Oct 2026 03:25:09 UTC
Source terms: CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 4.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N