CVE-2026-19607
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Sep 16, 2026
Vendor
unknown
Description
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.