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

- 種別: advisory
- 重大度: medium
- 関連技術: python
- CVE: CVE-2026-116684
- 公開日時: 2026-10-27T21:06:59.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-w4fh-qvv9-3v23)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-w4fh-qvv9-3v23

影響: pip:mcp >= 2.0.0, < 2.2.0 → 2.2.0, pip:mcp >= 1.10.0, < 1.30.0 → 1.30.0
In affected versions, the SDK's server-side bearer authentication had no way to check that a token was issued for your server (its audience). Where one authorization server issues tokens for several services, a valid token for another service was also accepted by your MCP server. Am I affected? Yes, if your HTTP server uses the SDK's bearer authentication (auth=AuthSettings(...) with token_verifier=), its authorization server also issues tokens for other services, and your TokenVerifier does no…