Description
A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP's signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Red Hat Red Hat build of Keycloak 26.4
Default version status: affected
26.4.9-1 to < *unaffected
Red Hat Red Hat build of Keycloak 26.4
Default version status: affected
26.4-11 to < *unaffected
Red Hat Red Hat build of Keycloak 26.4
Default version status: affected
26.4-10 to < *unaffected
Red Hat Red Hat build of Keycloak 26.4.9
Default version status: unaffected