CVE-2026-107889 — Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass
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…
Published: 2026-10-09 · CVSS: 5.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7