PT-2026-53226 · Pypi · Mcp Python Sdk
Published
2026-06-27
·
Updated
2026-06-27
·
CVE-2026-52870
None
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Name of the Vulnerable Software and Affected Versions
MCP Python SDK versions prior to 1.27.2
Description
A missing authorization issue exists in the official Model Context Protocol Python SDK. On multi-client servers, the default request handlers registered by the experimental
enable tasks() helper do not verify the identity of the caller, relying solely on task IDs and storing active workflows in a single global server store. This allows any authenticated client to enumerate, read, and hijack or cancel tasks belonging to other clients.Recommendations
Update to version 1.27.2 or later.
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Related Identifiers
Affected Products
Mcp Python Sdk