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CVE-2025-56406: Unauthenticated Access Vulnerability in mcp-neo4j 0.3.0

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Overview

The CVE-2025-56406 vulnerability affects the mcp-neo4j 0.3.0 system, exposing it to potential attacks that can compromise the system or leak data. This vulnerability is significant due to the potential for attackers to execute arbitrary commands or obtain sensitive information via the SSE service, even in the absence of mandatory authentication.

Vulnerability Summary

CVE ID: CVE-2025-56406
Severity: High – 7.5 CVSS
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System Compromise or Data Leakage

Affected Products

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Product | Affected Versions

mcp-neo4j | 0.3.0

How the Exploit Works

The CVE-2025-56406 vulnerability allows an attacker to gain unauthorized access to the mcp-neo4j 0.3.0 system. The vulnerability lies in the lack of authentication required for the MCP servers, giving attackers the ability to execute arbitrary commands or obtain sensitive information through the SSE service.

Conceptual Example Code

An example of how this vulnerability might be exploited could involve a malicious HTTP request, as shown below:

GET /vulnerable/SSEService HTTP/1.1
Host: target.example.com
{ "command": "execute_arbitrary_command_or_retrieve_sensitive_info" }

In this conceptual example, the attacker sends a GET request to the vulnerable SSE service endpoint. The malicious command provided in the request could result in the execution of an arbitrary command or the retrieval of sensitive information from the server.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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