Termix is a web-based server management platform with SSH terminal, tunneling, and file editing capabilities. The "POST /ssh/tunnel/connect" endpoint in Termix prior to version 2.3.2 builds an SSH tunnel command by interpolating user-controlled host record fields ("endpointIP", "endpointUsername", "password") directly into a shell command without escaping, allowing persistent OS command injection on the source SSH host. Version 2.3.2 patches the issue.