CVE-2026-18214: Red Hat Build Of Keycloak

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Keycloak allows users to log in using Google accounts and can be configured to only allow users from specific Google Workspace domains. A flaw was found where the token exchange feature, which allows swapping a Google token for a Keycloak token, does not check these domain restrictions. This means an attacker with a valid Google account from a different domain could bypass the security check and gain access to the Keycloak realm.

Affected products

• Red Hat Build Of Keycloak: affected versions not specified

Published 2026-07-31. Last modified 2026-09-16.