What’s Vulnerable › Vulnerabilities

CVE-2025-56406

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-10 · updated 2026-06-17
• Weakness: CWE-77

Description

An issue was discovered in mcp-neo4j 0.3.0 allowing attackers to obtain sensitive information or execute arbitrary commands via the SSE service. NOTE: the Supplier's position is that authentication is not mandatory for MCP servers, and the mcp-neo4j MCP server is only intended for use in a local environment where authentication realistically would not be needed. Also, the Supplier provides middleware to help isolate the MCP server from external access (if needed).

References

• https://github.com/August829/CVEP/issues/1
• https://github.com/neo4j-contrib/mcp-neo4j/issues/124
• https://modelcontextprotocol.io/specification/2025-03-26/basic/authorization

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