CVE•Published 2026-07-15•Modified 2026-10-24•1 article on news•6 live references•NVD data

CVE-2026-59950Lfprojects · Mcp_python_sdk

Vulnerability data via NVD (ingested)

CVSS v3.1

8.1

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 87% of all CVEs

Weaknesses (CWE)

CWE-346Origin Validation Error CWE-1385Missing Origin Validation in WebSockets

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.

Timeline

Published 2026-07-15

Modified 2026-10-24

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-59950

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Lfprojects Mcp Python Sdk"

All exposed Lfprojects Mcp Python Sdk instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Mcp Python Sdk"

HTTP body or banner mentions "Mcp Python Sdk" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-59950