TI-2026-82265 Aliases CVE-2026-66092 GHSA-xhf6-8p48-3pxq

Stored XSS in openEQUELLA pre-login notice via legacy logon page

LOW 22CWE-79Published 2026-10-29 · Updated 2026-10-29

Key facts

Attack vector: Network
Privileges required: High
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

In openEQUELLA before 2026.2, the pre-login notice is stored as HTML and rendered on the legacy logon page without encoding or sanitisation, which is a cross-site scripting flaw (CWE-79). A user holding the EDIT_SYSTEM_SETTINGS permission can set a notice containing arbitrary script, which runs on the login page for every visitor. Unauthenticated exploitation is possible where EDIT_SYSTEM_SETTINGS has been granted to the guest user or Everyone.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00326 25th percentileScored 2026-11-07

Fix Fixed openEQUELLA (Apereo Foundation): 2026.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apereo Foundation	openEQUELLA	2019.1 to before 2026.2	2026.2	Patch available	CNA

openEQUELLA VendorApereo Foundation Affected 2019.1 to before 2026.2 Fixed in 2026.2 Patch available CNA

Remediation

Upgrade openEQUELLA to version 2026.2 or later, which fixes the flaw in versions from 2019.1 before 2026.2.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA openEQUELLA (Apereo Foundation) Fixed in 2026.2

Timeline

2026-10-29 Threatist record created from CVE-2026-66092
2026-10-29 CISA SSVC decision points changed
2026-10-29 Alias added: GHSA-xhf6-8p48-3pxq

References

Advisory 1

https://github.com/openequella/openEQUELLA/security/advisories/GHSA-9jhj-7h37-3j2c

Other 1

https://openequella.github.io/guides/

TI-2026-47769 openEQUELLA < 2026.1.0 Authenticated RCE via Java Deserialization in HTTP Invoker CVSS 4.0HIGH 8.7
TI-2026-82261 OS command injection in openEQUELLA via system.execute CVSS 4.0CRITICAL 9.4
TI-2026-82264 Unauthenticated access to user details in openEQUELLA CVSS 4.0MEDIUM 6.9
TI-2026-82263 XML external entity injection in openEQUELLA allows file reads CVSS 4.0HIGH 7.1
TI-2026-82262 XML external entity injection in openEQUELLA SOAP API lets attackers read files CVSS 4.0MEDIUM 6.1
TI-2026-82260 Stored XSS via pre-login notice image upload in openEQUELLA CVSS 4.0MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences