Main Vulnerability Database Vulnerabilities #VU137320

Origin validation error in MCP Python SDK - CVE-2026-59950

Published: July 10, 2026

Vulnerability identifier: #VU137320

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2026-59950

CWE-ID: CWE-346

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Model Context Protocol

Affected software:
MCP Python SDK

Detailed vulnerability description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to origin validation error. A remote attacker can invoke the server's tools and read its resources

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