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CVE-2026-59950

Lfprojects Mcp Python Sdk vulnerability

8.1 HIGHEPSS 0.23%
  1. Published15 Jul 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

Lfprojects Mcp Python Sdk< 1.28.1

Remediation

Fixed in
Lfprojects Mcp Python Sdk≥ 1.28.1

References

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Frequently asked

Is CVE-2026-59950 being actively exploited?

CVE-2026-59950 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.23%.

How severe is CVE-2026-59950?

CVE-2026-59950 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.23% probability of exploitation.

Which products are affected by CVE-2026-59950?

Affected products include Lfprojects Mcp Python Sdk.

How do I fix CVE-2026-59950?

Upgrade affected software to a fixed version, for example Lfprojects Mcp Python Sdk 1.28.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-59950 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.