{"id":"PYSEC-2026-1620","summary":" Neo4j Cypher MCP server is vulnerable to DNS rebinding ","details":"### Impact\nDNS rebinding vulnerability in Neo4j Cypher MCP server allows malicious websites to bypass Same-Origin Policy protections and execute unauthorised tool invocations against locally running Neo4j MCP instances. The attack relies on the user being enticed to visit a malicious website and spend sufficient time there for DNS rebinding to succeed.\n\n### Patches\nCORS Middleware added to Cypher MCP server v0.4.0 that blocks all web-based access by default.\n\n### Workarounds\nIf you cannot upgrade to v0.4.0 and above, use stdio mode.\n\n### References\n[Vendor Advisory](https://neo4j.com/security/cve-2025-10193)\nhttps://www.cve.org/CVERecord?id=CVE-2025-10193 \n\nCredits\nWe want to publicly recognize the contribution of Evan Harris from [mcpsec.dev](https://mcpsec.dev/) for reporting this issue and following the responsible disclosure [policy](https://neo4j.com/trust-center/responsible-disclosure/).","aliases":["CVE-2025-10193","GHSA-vcqx-v2mg-7chx"],"modified":"2026-07-07T17:47:03.417894824Z","published":"2026-07-07T16:03:04.888877Z","references":[{"type":"WEB","url":"https://github.com/neo4j-contrib/mcp-neo4j/security/advisories/GHSA-vcqx-v2mg-7chx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-10193"},{"type":"WEB","url":"https://github.com/neo4j-contrib/mcp-neo4j/pull/165"},{"type":"WEB","url":"https://github.com/neo4j-contrib/mcp-neo4j/commit/5b9fbdda6401668d7aa006daf7e644805c067c15"},{"type":"PACKAGE","url":"https://github.com/neo4j-contrib/mcp-neo4j"},{"type":"WEB","url":"https://github.com/neo4j-contrib/mcp-neo4j/releases/tag/mcp-neo4j-cypher-v0.4.0"},{"type":"WEB","url":"https://neo4j.com/security/cve-2025-10193"},{"type":"PACKAGE","url":"https://pypi.org/project/mcp-neo4j-cypher"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-vcqx-v2mg-7chx"}],"affected":[{"package":{"name":"mcp-neo4j-cypher","ecosystem":"PyPI","purl":"pkg:pypi/mcp-neo4j-cypher"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.2.2"},{"fixed":"0.4.0"}]}],"versions":["0.2.2","0.2.3","0.2.4","0.3.0","0.3.1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/mcp-neo4j-cypher/PYSEC-2026-1620.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}