CVE-2026-52869

Katalog CVE

CVSS 7.1 · High EPSS 0,53%

Kerentanan Authorization Bypass Through User-Controlled Key pada lfprojects mcp python sdk. Skor CVSS 3.1 7.1 (High) menurut github.com.

Deskripsi (NVD)

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.27.2, the SSE and stateful Streamable HTTP transports mcp.server.sse.SseServerTransport and mcp.server.streamable_http_manager.StreamableHTTPSessionManager route requests to existing sessions using only the session_id query parameter or Mcp-Session-Id header without verifying the authenticated principal that created the session, allowing a different bearer-token-authenticated client with a known session ID to inject JSON-RPC messages into that session. This issue is fixed in version 1.27.2.

Rincian

Terbit di NVD

15 Juli 2026

Terakhir diubah

17 Juli 2026

Status NVD

Analyzed

CVSS 3.1

7.1 (High), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-639: Authorization Bypass Through User-Controlled Key

EPSS (30 hari)

0,53% peluang dieksploitasi; lebih tinggi dari 43,5% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-jpw9-pfvf-9f58 advisory vendor
• https://github.com/modelcontextprotocol/python-sdk/commit/1abcca2408a6b50e10ec601181f63f9978705c00 patch
• https://github.com/modelcontextprotocol/python-sdk/commit/ce267b6fc515dc4efc1dc70b6975b16ff0feef0a patch
• https://github.com/modelcontextprotocol/python-sdk/pull/2690 issue tracking · patch
• https://github.com/modelcontextprotocol/python-sdk/pull/2719 issue tracking · patch
• https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.27.2 release notes