CVE-2026-116684

MediumCVSS 6.8/10Last modified Nov 2, 2026

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.

Metrics

CVSS 3.1 6.8/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-863

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
modelcontextprotocol	python-sdk	>= 1.10.0, < 1.30.0; >= 2.0.0, < 2.2.0

References

Timeline

Published: Oct 27, 2026
Last modified: Nov 2, 2026
NVD status: Awaiting Analysis

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