CVE-2026-5724

Summary

The frontend gRPC server's streaming interceptor chain did not include the authorization interceptor. When a ClaimMapper and Authorizer are configured, unary RPCs enforce authentication and authorization, but the streaming AdminService/StreamWorkflowReplicationMessages endpoint accepted requests without credentials. This endpoint is registered on the same port as WorkflowService and cannot be disabled independently. An attacker with network access to the frontend port could open the replication stream without authentication. Data exfiltration is possible, but  only when a configured replication target is correctly configured and the attacker has knowledge of the cluster configuration, as the history service validates cluster IDs and peer membership before returning replication data.

Temporal Cloud is not affected.

Affected Software

VendorProductVersion RangeStatus
Temporal Technologies, Inc.temporal1.24.0 <= 1.30.3affected
Temporal Technologies, Inc.temporal1.24.0 <= 1.29.5affected
Temporal Technologies, Inc.temporal1.24.0 <= 1.28.3affected

Weaknesses

  • CWE-306: CWE-306 Missing authentication for critical function

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References