CVE-2026-107889EPSS p17.5%

CVE-2026-107889CVE-2026-107889

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.

Scoring

CVSS 5.5 ()
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
EPSS0.27% probability of exploitation · percentile 17.5% · 2026-10-10T12:00:23Z
Last modified2026-10-09
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.