CVE-2026-66092 PUBLISHED

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

Assigner: MON-CSIRT
Reserved: 24.07.2026 Published: 29.10.2026 Updated: 29.10.2026

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

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 4.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	High
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Apereo Foundation
Product	openEQUELLA
Versions	Default: unaffected affected from 2019.1 to 2026.2 (excl.)

Solutions

Update to vendor recommended versions

Credits

Nguyễn Tuấn Hùng ( University of Information Technology: VNUHCM - UIT ) finder
Lê Ngọc Bảo Minh ( University of Information Technology: VNUHCM - UIT ) finder

References

Problem Types

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

Impacts

CAPEC-592 Stored XSS