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CVSS Score

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CVE-2025-10193

CVE-2025-10193: Neo4j Cypher MCP server is vulnerable to DNS rebinding

Impact

DNS 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.

Patches

CORS Middleware added to Cypher MCP server v0.4.0 that blocks all web-based access by default.

Workarounds

If you cannot upgrade to v0.4.0 and above, use stdio mode.

References

Vendor Advisory https://www.cve.org/CVERecord?id=CVE-2025-10193

Credits We want to publicly recognize the contribution of Evan Harris from mcpsec.dev for reporting this issue and following the responsible disclosure policy.

(GitHub Advisory)

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CVE-2025-10193

CVE-2025-10193:

N/A

CVSS Score

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
mcp-neo4j-cypher	pip	>= 0.2.2, < 0.4.0	0.4.0

Technical Details

Vulnerability Intelligence
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Root Cause Analysis

The vulnerability is a DNS rebinding issue in the Neo4j Cypher MCP server, which is caused by a lack of proper origin and host validation on the server. The provided patch addresses this by introducing CORS and Trusted Host middleware. The analysis of the commit 5b9fbdda6401668d7aa006daf7e644805c067c15 reveals that the main function in servers/mcp-neo4j-cypher/src/mcp_neo4j_cypher/server.py is the central point where the server is configured and launched. The patch modifies this function to include CORSMiddleware and TrustedHostMiddleware. The absence of these security controls in the main function prior to the patch is the root cause of the vulnerability. Any exploitation of this vulnerability would involve an HTTP or SSE request that is processed by the server started from this main function. Therefore, mcp_neo4j_cypher.server.main is the key function that would appear in a runtime profile during exploitation.

Vulnerable functions

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WAF Rule

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Reasoning

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