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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
تطبيق معيار RFC 8707 هو الأساس المعماري لعزل الصلاحيات عند تعدد خوادم MCP، بحيث يجبر العميل على طلب توكن مخصص لـ URI الخادم المعني فقط مع حصر الـ Scopes. تفاصيل الثغرة رقم CVE 2026 116684 والبلاغ الرسمي: https://cvetracker.app/cve/CVE-2026-116684
🟠 #Python MCP SDK, Server Bearer Authentication Audience Bypass, #CVE-2026-116684 (Medium) -DC-Oct2026-3858 https://dailycve.com/python-mcp-sdk-server-bearer-authentication-audience-bypass-cve-2026-116684-medium-dc-oct2026-3858/