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Vulnerability Details CVE-2026-59950

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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 4.7%

CVSS Severity

CVSS v3 Score 8.1

References

Products affected by CVE-2026-59950

Lfprojects » Mcp Python Sdk » Version: 0.2.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.2.0
Lfprojects » Mcp Python Sdk » Version: 0.3.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.3.0
Lfprojects » Mcp Python Sdk » Version: 0.5.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.5.0
Lfprojects » Mcp Python Sdk » Version: 0.6.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.6.0
Lfprojects » Mcp Python Sdk » Version: 0.8.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.8.0
Lfprojects » Mcp Python Sdk » Version: 0.9.0

cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.0
Lfprojects » Mcp Python Sdk » Version: 0.9.1

cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.1
Lfprojects » Mcp Python Sdk » Version: 1.0.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.0.0
Lfprojects » Mcp Python Sdk » Version: 1.1.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.0
Lfprojects » Mcp Python Sdk » Version: 1.1.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.1
Lfprojects » Mcp Python Sdk » Version: 1.1.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.2
Lfprojects » Mcp Python Sdk » Version: 1.1.3

cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.3
Lfprojects » Mcp Python Sdk » Version: 1.10.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.0
Lfprojects » Mcp Python Sdk » Version: 1.10.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.1
Lfprojects » Mcp Python Sdk » Version: 1.11.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.11.0
Lfprojects » Mcp Python Sdk » Version: 1.12.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.0
Lfprojects » Mcp Python Sdk » Version: 1.12.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.1
Lfprojects » Mcp Python Sdk » Version: 1.12.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.2
Lfprojects » Mcp Python Sdk » Version: 1.12.3

cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.3
Lfprojects » Mcp Python Sdk » Version: 1.12.4

cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.4
Lfprojects » Mcp Python Sdk » Version: 1.13.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.0
Lfprojects » Mcp Python Sdk » Version: 1.13.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.1
Lfprojects » Mcp Python Sdk » Version: 1.14.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.0
Lfprojects » Mcp Python Sdk » Version: 1.14.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.1
Lfprojects » Mcp Python Sdk » Version: 1.15.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.15.0
Lfprojects » Mcp Python Sdk » Version: 1.16.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.16.0
Lfprojects » Mcp Python Sdk » Version: 1.17.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.17.0
Lfprojects » Mcp Python Sdk » Version: 1.18.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.18.0
Lfprojects » Mcp Python Sdk » Version: 1.19.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.19.0
Lfprojects » Mcp Python Sdk » Version: 1.2.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.0
Lfprojects » Mcp Python Sdk » Version: 1.2.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.1
Lfprojects » Mcp Python Sdk » Version: 1.20.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.20.0
Lfprojects » Mcp Python Sdk » Version: 1.21.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.0
Lfprojects » Mcp Python Sdk » Version: 1.21.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.1
Lfprojects » Mcp Python Sdk » Version: 1.21.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.2
Lfprojects » Mcp Python Sdk » Version: 1.22.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.22.0
Lfprojects » Mcp Python Sdk » Version: 1.23.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.0
Lfprojects » Mcp Python Sdk » Version: 1.23.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.1
Lfprojects » Mcp Python Sdk » Version: 1.23.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.2
Lfprojects » Mcp Python Sdk » Version: 1.23.3

cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.3
Lfprojects » Mcp Python Sdk » Version: 1.24.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.24.0
Lfprojects » Mcp Python Sdk » Version: 1.25.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.25.0
Lfprojects » Mcp Python Sdk » Version: 1.26.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.26.0
Lfprojects » Mcp Python Sdk » Version: 1.27.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.0
Lfprojects » Mcp Python Sdk » Version: 1.27.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.1
Lfprojects » Mcp Python Sdk » Version: 1.27.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.2
Lfprojects » Mcp Python Sdk » Version: 1.28.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.28.0
Lfprojects » Mcp Python Sdk » Version: 1.3.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.3.0
Lfprojects » Mcp Python Sdk » Version: 1.4.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.0
Lfprojects » Mcp Python Sdk » Version: 1.4.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.1
Lfprojects » Mcp Python Sdk » Version: 1.5.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.5.0
Lfprojects » Mcp Python Sdk » Version: 1.6.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.6.0
Lfprojects » Mcp Python Sdk » Version: 1.7.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.0
Lfprojects » Mcp Python Sdk » Version: 1.7.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.1
Lfprojects » Mcp Python Sdk » Version: 1.8.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.0
Lfprojects » Mcp Python Sdk » Version: 1.8.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.1
Lfprojects » Mcp Python Sdk » Version: 1.9.0

cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.0
Lfprojects » Mcp Python Sdk » Version: 1.9.1

cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.1
Lfprojects » Mcp Python Sdk » Version: 1.9.2

cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.2
Lfprojects » Mcp Python Sdk » Version: 1.9.3

cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.3
Lfprojects » Mcp Python Sdk » Version: 1.9.4

cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.4

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Vulnerability Details CVE-2026-59950

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