Vulnerability · Published Oct 29, 2026 · Assigned by MON-CSIRT

CVE-2026-66092Stored XSS in pre-login notice via reachable legacy logon route

Medium 4.8

In plain English

A medium-severity cross-site scripting in openEQUELLA from Apereo Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.3%top 74.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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

Affected products (as reported)

Vendor	Product	Versions
Apereo Foundation	openEQUELLA	2019.1 – before 2026.2

Weakness: CWE-79 · Vector: 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

References

https://github.com/openequella/openEQUELLA/security/advisories/GHSA-9jhj-7h37-3j2c vendor-advisory
https://openequella.github.io/guides/ product