The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients.
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.
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Modelcontextprotocol
- Product
- python-sdk
- CVSS v3.1
- 6.8 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- Fix
- available
- Weakness
- CWE-863
- Exposure class
- AI infrastructure
- NVD status
- Received
Why it ranks 13 (Routine)
- CVSS v3.1 6.8 medium
- Product class: AI infrastructure
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- CVE-2026-116684 on this site · NVD · CVE.org · Vulnpedia
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