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Temporal Server contains an authorization flaw in the frontend gRPC server: the streaming interceptor chain did not include the authorization interceptor. As a result, when ClaimMapper and Authorizer are configured, unary RPCs correctly enforce authentication and authorization, but the streaming AdminService/StreamWorkflowReplicationMessages endpoint does not. This endpoint is exposed on the same frontend port as WorkflowService and cannot be disabled independently. An attacker with network access to the frontend gRPC port can open the replication stream without providing credentials. The history service still validates cluster IDs and peer membership before returning replication data, so exploitation for data access depends on a correctly configured replication target and attacker knowledge of the cluster configuration. Temporal Cloud is not affected.
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