Many modified panels (e.g., "CCcam Panel Pro v7" or "Ultimate CCcam Panel") contain hidden PHP shells. Once you upload the panel to your web server (especially if running on a public IP), attackers can execute system commands, delete your configuration, or even lock your files and demand a Bitcoin ransom.
Run sudo apt update && sudo apt upgrade to ensure your VPS is secure and up to date.
If you are a master admin, you can assign "credits" to resellers so they can create their own lines. 5. Important Security Considerations