# CVE-2026-5724: Missing Authentication on Streaming gRPC Replication Endpoint

> CVE-2026-5724: Missing Authentication on Streaming gRPC Replication Endpoint. CVSS 6.3 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-5724
Last updated: 2026-07-08T20:17:00Z

- Published: 2026-04-10 21:06 UTC · Updated: 2026-07-08 20:17 UTC · Assigner: Temporal
- CVSS: 6.3 (CVSS 4.0) · Severity: Medium
- EPSS: 0.53%, 44th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-306

## 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. The fix was applied per release line: it is present in 1.28.4, 1.29.6, 1.30.4, 1.31.2, and 1.32.0 and later releases on each line. Releases 1.31.0 and 1.31.1 do not contain the fix and are affected. Temporal Cloud is not affected.

## Affected vendors and products

- Temporal Technologies, Inc.: temporal

## Tracked companies

- [Temporal Cloud](https://rewindex.com/company/temporal-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-5724)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-5724)
- [https://github.com/temporalio/temporal/releases/tag/v1.28.4](https://github.com/temporalio/temporal/releases/tag/v1.28.4)
- [https://github.com/temporalio/temporal/releases/tag/v1.29.6](https://github.com/temporalio/temporal/releases/tag/v1.29.6)
- [https://github.com/temporalio/temporal/releases/tag/v1.30.4](https://github.com/temporalio/temporal/releases/tag/v1.30.4)
- [https://github.com/temporalio/temporal/releases/tag/v1.31.2](https://github.com/temporalio/temporal/releases/tag/v1.31.2)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-5724 · Markdown: https://rewindex.com/cve/CVE-2026-5724.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-5724 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:52.411Z