Keep WHMCS up to date with the latest releases and security patches. Regularly check for updates on the official WHMCS website.
Enforce strong passwords for WHMCS admin accounts. Implement two-factor authentication (2FA) to add an extra layer of security.
Choose a secure hosting environment with up-to-date server software. Ensure that your server operating system, web server, and PHP are all kept current with security updates.
Implement a firewall to restrict access to only necessary ports and IP addresses. Regularly review and update firewall rules to ensure they align with your security policies.
Conduct regular security audits on your WHMCS installation. This can include vulnerability scans and penetration testing. Stay informed about security advisories and updates related to WHMCS.