CVE-2026-107889

medium

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.

References

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95478

https://bugzilla.redhat.com/show_bug.cgi?id=2548355

https://access.redhat.com/security/cve/CVE-2026-107889

Details

Source: Mitre, NVD

Published: 2026-10-09

Updated: 2026-10-13

Risk Information

CVSS v2

Base Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:M/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.00268