CVE-2026-59950

HighCVSS 8.1/10Last modified Oct 24, 2026

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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-346CWE-1385

Affected software

No affected versions have been published.

Timeline

Published
Jul 15, 2026
Last modified
Oct 24, 2026
NVD status
Analyzed

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