CVE-2026-18214 Red Hat CVE debrief

Who should care

Administrators and security teams using Keycloak with Google account login and domain restrictions should be aware of this vulnerability and take necessary actions to protect their systems. They should verify their Keycloak configurations to ensure domain restrictions are properly enforced and update to a patched version if available. Additionally, they should monitor for suspicious activity related to Google account logins and token exchange, and review and adjust access controls for Keycloak realms. This may involve coordinating with Google Workspace administrators to ensure proper domain restrictions are in place. Security teams should also consider implementing additional security measures, such as multi-factor authentication, to further protect their systems. IT teams responsible for Keycloak deployments should prioritize patching and verifying configurations to prevent potential attacks. End-users with Google accounts who access Keycloak realms may also be impacted and should be aware of potential security risks. Keycloak administrators should review their instance's configuration and update to a patched version to prevent exploitation. Security teams should also review their incident response plans to ensure they are prepared to respond to potential attacks exploiting this vulnerability. Compliance teams may also need to review and update their organization's security policies and procedures to address this vulnerability. By taking these steps, organizations can help protect their systems and prevent potential attacks. The whoShouldCare section provides guidance on who should be aware of this vulnerability and what actions they should take to protect their systems. It emphasizes the importance of verifying Keycloak configurations, updating to a patched version, and monitoring for suspicious activity. It also highlights the need for security teams to consider implementing additional security measures, such as multi-factor authentication, to further protect their systems. Finally, it notes that end-users with Google accounts who access Keycloak realms may also be impacted and should be aware of potential security risks. Overall, the whoShouldCare section is

Technical summary

The Keycloak token exchange feature, which allows swapping a Google token for a Keycloak token, does not check domain restrictions. This flaw could allow an attacker with a valid Google account from a different domain to bypass security checks and gain access to the Keycloak realm. The technical summary highlights the vulnerability's technical aspects, including the affected feature and potential attack vectors. Keycloak's token exchange feature is used to swap a Google token for a Keycloak token, but it does not properly enforce domain restrictions. This could lead to unauthorized access to the Keycloak realm.

Defensive priority

Organizations using Keycloak with Google account login and domain restrictions should verify their configurations and update to a patched version if available.

Recommended defensive actions

• Verify Keycloak configurations to ensure domain restrictions are properly enforced.
• Update to a patched version of Keycloak if available.
• Monitor for suspicious activity related to Google account logins and token exchange.
• Review and adjust access controls for Keycloak realms.
• Consider implementing additional security measures, such as multi-factor authentication.

Evidence notes

The CVE record indicates a flaw in Keycloak's token exchange feature, which allows swapping a Google token for a Keycloak token without checking domain restrictions. This could allow an attacker with a valid Google account from a different domain to bypass security checks and gain access to the Keycloak realm. The record was published by the NVD and has references from Red Hat's security team.

Official resources