CVE-2025-56406

7.5 highEPSS 0.5%

High (7.5). EPSS 0.5% chance of exploitation in the next 30 days.

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).

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 41% of CVEs (scores of 2026-10-31)
CWEs: CWE-77, CWE-200, CWE-284
Published: 2025-09-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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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