CVE-2026-107889
MEDIUM
NVD
CVSS Score
5.5
Severity
MEDIUM
Published
Oct 09, 2026
Vendor
unknown
Description
A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security filter responsible for cleaning user input can be bypassed, allowing a realm administrator to store malicious scripts in display fields. This could result in unauthorized JavaScript execution in the browsers of users visiting the login page, potentially leading to data exposure or session interference.