CVE-2026-0756
📋 TL;DR
This is a critical command injection vulnerability in github-kanban-mcp-server that allows unauthenticated remote attackers to execute arbitrary system commands. The vulnerability exists in the create_issue parameter handling where user input isn't properly sanitized before being passed to system calls. All deployments of the vulnerable software are affected.
💻 Affected Systems
- github-kanban-mcp-server
⚠️ 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
Complete system compromise with attacker gaining full control of the server, data exfiltration, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to service disruption, data theft, and potential cryptocurrency mining or ransomware deployment.
If Mitigated
Attack blocked at network perimeter with no internet-facing exposure and proper input validation in place.
🎯 Exploit Status
Command injection vulnerabilities are typically easy to exploit with simple payloads. The ZDI advisory suggests active exploitation is probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-26-022/
Restart Required: Yes
Instructions:
1. Review the ZDI advisory for patch details
2. Update github-kanban-mcp-server to the latest patched version
3. Restart the service to apply changes
4. Verify the fix is working
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to the service using firewall rules
iptables -A INPUT -p tcp --dport [PORT] -s [TRUSTED_IPS] -j ACCEPT
iptables -A INPUT -p tcp --dport [PORT] -j DROP
Input Validation Wrapper
allImplement input validation middleware to sanitize create_issue parameter
🧯 If You Can't Patch
- Immediately restrict network access to trusted sources only using firewall rules
- Monitor logs for suspicious command execution patterns and implement rate limiting
🔍 How to Verify
Check if Vulnerable:
Check if github-kanban-mcp-server is running and accessible without authentication on create_issue endpointCheck Version:
Check package version or consult deployment documentationVerify Fix Applied:
Test the create_issue endpoint with command injection payloads and verify they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in system logs
- Suspicious process creation from the service account
- Multiple failed or unusual create_issue requests
Network Indicators:
- Unusual outbound connections from the service
- Traffic to known malicious IPs or domains
- Abnormal request patterns to the vulnerable endpoint
SIEM Query:
source="github-kanban-mcp-server" AND (command="*;*" OR command="*|*" OR command="*`*" OR command="*$(*")