CVE•Published 2026-07-15•Modified 2026-07-17•1 article on news•5 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
8
Exploit Prediction Scoring System · top 92% of all CVEs
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 2026-07-17
External references
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-2026-59950Hosts 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-2026-59950Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-59950Censys host search filtered to this CVE id.
grep.app
CVE-2026-59950Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-59950GitHub code search for direct mentions.
Google dork
"CVE-2026-59950" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.