CVE-2025-12150: Red Hat Build Of Keycloak

Low severity, CVSS 3.1. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the configured attestation policy and register untrusted or forged authenticators via submission of an attestation object with fmt: "none", even when the realm is configured to require direct attestation. This can lead to weakened authentication integrity and unauthorized authenticator registration.

Affected products

• Red Hat Build Of Keycloak: before 26.4.4 (fixed in 26.4.4); affected versions not specified
• Red Hat Keycloak: version 24.0.2 only

Published 2026-02-27. Last modified 2026-08-10.