CVE WatchOct 27, 2026

CVE-2026-116684

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 an

CVSS

6.8

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 27, 2026 · Last modified: Oct 27, 2026 · CWE-863

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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