CVE-2026-5724

Description

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.

PUBLISHED Reserved 2026-04-06 | Published 2026-04-10 | Updated 2026-04-13 | Assigner Temporal

Problem types

CWE-306 Missing authentication for critical function

Product status

Credits

Tiberiu Baron of UiPath's security team finder

References

github.com/temporalio/temporal/releases/tag/v1.29.6 patch

github.com/temporalio/temporal/releases/tag/v1.30.4 patch

github.com/temporalio/temporal/releases/tag/v1.28.4 patch

cve.org (CVE-2026-5724)

nvd.nist.gov (CVE-2026-5724)

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