{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-59950", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-07T18:49:15.607Z", "datePublished": "2026-07-15T20:08:54.095Z", "dateUpdated": "2026-07-15T20:08:54.095Z"}, "containers": {"cna": {"title": "MCP Python SDK: WebSocket server transport does not support Host/Origin validation", "problemTypes": [{"descriptions": [{"cweId": "CWE-346", "lang": "en", "description": "CWE-346: Origin Validation Error", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-1385", "lang": "en", "description": "CWE-1385: Missing Origin Validation in WebSockets", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.6, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-vj7q-gjh5-988w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-vj7q-gjh5-988w"}, {"name": "https://github.com/modelcontextprotocol/python-sdk/pull/2992", "tags": ["x_refsource_MISC"], "url": "https://github.com/modelcontextprotocol/python-sdk/pull/2992"}, {"name": "https://github.com/modelcontextprotocol/python-sdk/commit/777b8d06710c140e3606b0d4598e2aa48546c266", "tags": ["x_refsource_MISC"], "url": "https://github.com/modelcontextprotocol/python-sdk/commit/777b8d06710c140e3606b0d4598e2aa48546c266"}, {"name": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.28.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.28.1"}], "affected": [{"vendor": "modelcontextprotocol", "product": "python-sdk", "versions": [{"version": "< 1.28.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-15T20:08:54.095Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-vj7q-gjh5-988w", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.28.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "python-sdk", "source": "cna", "vendor": "modelcontextprotocol"}, "product": "python-sdk", "vendor": "modelcontextprotocol"}], "created": "2026-07-15T23:45:15.916442+00:00", "updated": "2026-07-15T23:45:15.916469+00:00", "vendors": ["modelcontextprotocol", "modelcontextprotocol$PRODUCT$python-sdk"]}