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

published 2026-10-29 11 d ago modified 2026-10-29 10 d ago also EUVD-2026-112568

cvss: 4.8; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits: 0; none known

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

Patch / fix

fixed in 1

Apereo Foundation openEQUELLA 2026.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 11 d ago (2026-10-29)

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	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
CNA	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Apereo Foundation openEQUELLA

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

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

Sources

CVE List CVE-2026-66092
NVD CVE-2026-66092

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary