Analysis of CVE-2025-14986: Temporal's Masked Namespace Vulnerability Enabling Cross-Tenant Security Bypass
By
bmit
Lightly toasted, lightly seasoned, mostly correct.
Summary
The article details CVE-2025-14986, a security vulnerability in Temporal's ExecuteMultiOperation endpoint that allows cross-tenant policy and schema confusion. The vulnerability stems from a masked namespace issue where bundled APIs enable inner operations to carry different namespaces than the outer request, bypassing authorization checks. The author explains how this identity-binding bug works, its security implications, and the broader risks of bundled APIs in distributed systems.
Key quotes
· 4 pulledDevelopers love 'bundled' APIs. They offer atomicity and efficiency, allowing you to chain complex state changes into a single network request. Security engineers, however, should fear them.
It was an identity-binding bug: the outer request passed authorization for one namespace, but an inner operation carried a different namespace that the server used during request preparation.
Bundling introduces complexity, and complexity is where the bugs hide.
The vulnerability enables cross-tenant policy and schema confusion via bundled APIs.
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