Model Context Protocol Python SDK: Server bearer-token authentication accepts tokens issued for a different resource server

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CVE-2026-116684 · Microsoft / collected KEV context

cve-program · CVE-2026-116684

• https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-w4fh-qvv9-3v23
• https://github.com/modelcontextprotocol/python-sdk/pull/3447
• https://github.com/modelcontextprotocol/python-sdk/pull/3451
• https://github.com/modelcontextprotocol/python-sdk/commit/0c9136841ff092987a20700ff9c2c9789bda2f40
• https://github.com/modelcontextprotocol/python-sdk/commit/8c2fa6eabacde869d75568e33b9d466b58c2f512
• https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.30.0
• https://github.com/modelcontextprotocol/python-sdk/releases/tag/v2.2.0

• Model Context Protocol Python SDK: Server bearer-token authentication accepts tokens issued for a different resource server · Newly collected advisory · 27 Oct 2026