Neo4j Cypher MCP server is vulnerable to DNS rebinding

CVE-2025-10193 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

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.

Basic information

Type
reviewed
Severity
high
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-09-11 23:26:00 UTC
Updated
2025-09-11 23:26:01 UTC
GitHub reviewed
2025-09-11 23:26:00 UTC
NVD published
2025-09-11

EPSS Score

Score Percentile
0.02% 6.06%

CVSS Scores

Base score Version Severity Vector
7.4 4.0 —
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 Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:H)
Exploitation depends on constrained or hard-to-reproduce conditions.
Attack requirements (AT:P)
Additional preconditions must be present for exploitation.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:A)
User interaction is required in an active way.
Vulnerable system confidentiality impact (VC:H)
High confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:H)
High integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.

Identifiers

Type Value
GHSA GHSA-vcqx-v2mg-7chx ↗
CVE CVE-2025-10193 ↗

CWEs

CWE id Name
CWE-346 Origin Validation Error

Credits

  • eharris128 (reporter)

Affected packages (1)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
pip mcp-neo4j-cypher >= 0.2.2, < 0.4.0 0.4.0 —

References

cvelogic Threat Intelligence