CVE-2026-116684
Description
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.10.0 until 1.30.0 and 2.2.0, server-side bearer authentication configured through AuthSettings with token_verifier accepts a valid token issued for another service when the authorization server serves multiple resources and the TokenVerifier does not independently validate the aud audience. This resource-confusion flaw lets a token holder authenticate to the wrong MCP server and exercise that token's resulting access. This issue is fixed in versions 1.30.0 and 2.2.0.
How to fix
- mcp2.2.0, 1.30.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mcpPyPI | 2.0.0 ≤ v < 2.2.0, 1.10.0 ≤ v < 1.30.0 | 2.2.0, 1.30.0 |
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