Temporal up to 1.27.3/1.28.1/1.29.1 History Service authorization

Summaryinfo

A vulnerability identified as critical has been detected in Temporal up to 1.27.3/1.28.1/1.29.1. The affected element is an unknown function of the component History Service. This manipulation causes authorization. This vulnerability appears as CVE-2025-14987. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Temporal up to 1.27.3/1.28.1/1.29.1. Affected by this vulnerability is some unknown functionality of the component History Service. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-14987 since 12/19/2025. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.27.4 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• Temporal

Version

• 1.27.0
• 1.27.1
• 1.27.2
• 1.27.3
• 1.28.0
• 1.28.1
• 1.29.0
• 1.29.1

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