Security Flaw in Keycloak's IdentityBrokerService Allows Unauthorized Authentication
CVE-2026-3009
8.1HIGH
Key Information:
- Vendor
Red Hat
- Status
- Vendor
- CVE Published:
- 5 March 2026
What is CVE-2026-3009?
A security flaw exists in Keycloak's IdentityBrokerService.performLogin endpoint, which allows the authentication process through a disabled Identity Provider (IdP). Admins disabling an IdP do not prevent an attacker, possessing knowledge of the IdP alias, from leveraging a previously generated login request, enabling them to bypass access control measures. This vulnerability compromises the integrity of authentication workflows, potentially allowing unauthorized entities to gain access through external providers that administrators have disabled.
Affected Version(s)
Red Hat build of Keycloak 26.4 26.4.10-1
Red Hat build of Keycloak 26.4 26.4-12
Red Hat build of Keycloak 26.4 26.4-12