CVE-2026-66092

Stored XSS in pre-login notice via reachable legacy logon route

State: Published
Severity: 4.8 Medium
Published: Oct 29, 2026
Updated: Oct 29, 2026
Reserved: Jul 24, 2026

Description

In openEQUELLA before 2026.2, the pre-login notice is stored as HTML and rendered on the legacy logon page without encoding or sanitisation. A user holding the EDIT_SYSTEM_SETTINGS permission can set a notice containing an arbitrary script (PUT /api/preloginnotice), resulting in stored cross-site scripting on the login page. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or Everyone

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	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	MON-CSIRT

Weaknesses

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Affected Products

Product	Versions
openEQUELLAApereo Foundation	2019.1 to before 2026.2Affected

References

https://github.com/openequella/openEQUELLA/security/advisories/GHSA-9jhj-7h37-3j2cvendor-advisory
https://openequella.github.io/guides/product

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