CVE-2025-14987 Cross Namespace Commands Authorization Bypass
Attackers can execute workflow commands in unauthorized namespaces, allowing cross-namespace workflow creation, signaling, or cancellation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-14987?
CVE-2025-14987 is a medium-severity missing authorization vulnerability in Temporal, published on 30 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-863
Which versions are affected by CVE-2025-14987?
9 open source packages ship an affected version, including go.temporal.io/server.
| Package | Affected | Fixed in |
|---|---|---|
go.temporal.io/server Go | All versions | 1.27.4, 1.28.2, 1.29.2 |
go.temporal.io/server Go | All versions | 1.27.4 |
go.temporal.io/server Go | All versions | 1.27.4 |
go.temporal.io/server Go | From 1.28.0 | 1.28.2 |
go.temporal.io/server Go | From 1.28.0 | 1.28.2 |
go.temporal.io/server Go | From 1.29.0 | 1.29.2 |
3 more packages
go.temporal.io/server Go | From 1.29.0 | 1.29.2 |
go.temporal.io/server Go | From 1.29.0-0 | 1.29.0-135.0.0.20251218190115-b292a32bacdf |
go.temporal.io/server Go | From 1.29.0-0 | 1.29.0-135.0.0.20251218190115-b292a32bacdf |
How do I fix CVE-2025-14987?
Upgrade go.temporal.io/server to a fixed version for your release line: 1.27.4, 1.28.2, 1.29.2 or 1.29.0-135.0.0.20251218190115-b292a32bacdf.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-14987 being exploited?
There is no known exploitation of CVE-2025-14987 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-HC51017, CLEANSTART-2026-UB40516, ECHO-b73c-fd45-410f, GHSA-hmhp-gh8m-c8xp, GO-2026-4273.