CVE WatchOct 29, 2026

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 o

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

0-100

Published: Oct 29, 2026 · Last modified: Oct 29, 2026 · CWE-434

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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53.9%

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