Ensure that your WHMCS installation is always up to date with the latest version. Developers regularly release updates that include security patches and improvements.
Enable two-factor authentication for both clients and administrators. This adds an extra layer of security by requiring a secondary authentication method in addition to the password.
Use SSL (Secure Socket Layer) to encrypt data transmission between the server and clients. This is crucial for securing sensitive information such as login credentials and payment details.
Restrict access to the WHMCS admin area by whitelisting specific IP addresses. This reduces the risk of unauthorized access to sensitive areas of your system.
Assign administrator roles and permissions based on the principle of least privilege. Only grant access to the functionalities required for each role.