Missing Authentication on Streaming gRPC Replication Endpoint_CVE-2026-5724

6.3 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:L/SI:N/SA:N/S:N/AU:N/R:U/RE:L

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.

Basic Information

ID CVE-2026-5724

Source Temporal

Published Apr 10, 2026 at 21:06

Modified Apr 10, 2026 at 21:22

Affected Product

Vendor Temporal Technologies, Inc.

Product temporal

Version 1.24.0

Affected Versions Temporal Technologies, Inc. temporal 1.24.0
Temporal Technologies, Inc. temporal 1.24.0
Temporal Technologies, Inc. temporal 1.24.0

CWE Classification

CWE-306

References

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    "published": "2026-04-10T21:06:31.788Z",
    "modified": "2026-04-10T21:22:30.134Z",
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