Vulnerability · Published Dec 30, 2025 · Assigned by Temporal
CVE-2025-14987Cross Namespace Commands Authorization Bypass
Medium 5.3
In plain English
A medium-severity incorrect authorization in Temporal from Temporal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
When system.enableCrossNamespaceCommands is enabled (on by default), the Temporal server permits certain workflow task commands (e.g. StartChildWorkflowExecution, SignalExternalWorkflowExecution, RequestCancelExternalWorkflowExecution) to target a different namespace than the namespace authorized at the gRPC boundary. The frontend authorizes RespondWorkflowTaskCompleted based on the outer request namespace, but the history service later resolves and executes the command using the namespace embedded in command attributes without authorizing the caller for that target namespace. This can allow a worker authorized for one namespace to create, signal, or cancel workflows in another namespace. This issue affects Temporal: through 1.29.1. Fixed in 1.27.4, 1.28.2, 1.29.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | go.temporal.io/server | 1.27.4 | GHSA-hmhp-gh8m-c8xp |
| Go | go.temporal.io/server | 1.28.2 | GHSA-hmhp-gh8m-c8xp |
| Go | go.temporal.io/server | 1.29.2 | GHSA-hmhp-gh8m-c8xp |
| Go | go.temporal.io/server | 1.29.0-135.0.0.20251218190115-b292a32bacdf | GHSA-hmhp-gh8m-c8xp |
| Go | go.temporal.io/server | 1.27.4, 1.28.2, 1.29.2 | GO-2026-4273 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L