VULNERABILITY INTELLIGENCE

CVE-2026-59950

CVSS score8.1 HIGH
EPSS probability0.23%
CISA KEVNot currently listed
Published2026-07-15
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Description

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.28.1, the deprecated mcp.server.websocket.websocket_server transport accepted WebSocket handshakes without applying Host or Origin header validation, leaving no SDK-level way to restrict which origins could connect to applications that exposed that transport. This issue is fixed in version 1.28.1.

Weakness classification

  • security-advisories@github.com: CWE-346

Primary references