CVE-2025-56406
📋 TL;DR
CVE-2025-56406 is an improper neutralization vulnerability in mcp-neo4j 0.3.0 that allows attackers to execute arbitrary commands or access sensitive information via the SSE service. This affects users running mcp-neo4j servers without proper authentication controls. The vendor notes the software is intended for local environments where authentication may not be needed.
💻 Affected Systems
- mcp-neo4j
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise and data exfiltration.
Likely Case
Information disclosure of sensitive Neo4j database credentials or configuration data.
If Mitigated
Minimal impact if server is isolated in local environment with no external access.
🎯 Exploit Status
CWE-77 indicates command injection, which typically has low exploitation complexity when unauthenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/neo4j-contrib/mcp-neo4j/issues/124
Restart Required: No
Instructions:
No official patch available. Monitor GitHub repository for updates.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict network access to mcp-neo4j server using firewall rules
sudo ufw deny from any to any port 8080
sudo iptables -A INPUT -p tcp --dport 8080 -j DROP
Authentication Middleware
allImplement vendor-provided middleware to add authentication layer
🧯 If You Can't Patch
- Deploy mcp-neo4j only in isolated local environments with no network access
- Implement network segmentation and strict firewall rules to prevent external access
🔍 How to Verify
Check if Vulnerable:
Check if running mcp-neo4j version 0.3.0 and if SSE service is exposedCheck Version:
Check package.json or installation logs for mcp-neo4j versionVerify Fix Applied:
Verify server is not accessible from untrusted networks and authentication is implemented📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- SSE service access from unexpected sources
Network Indicators:
- Traffic to mcp-neo4j SSE endpoints from external IPs
- Unusual payloads in SSE requests
SIEM Query:
source="mcp-neo4j" AND (event="command_execution" OR event="sse_access")