CVE-2026-19607

No fix known EPSS <1%CVSS 5.3

A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.

Published 2026-09-16 · CVE record · OSV

Products: Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.16, Red Hat build of Keycloak 26.6, Red Hat build of Keycloak 26.6.7, Red Hat Single Sign-On 7

Distro releases