How to enable exec() on your cPanel/WHM account when disable_functions is empty? – warning exec() disabled for security reasons

First, check to see if your PHP-FPM is running for your cPanel account.

Head to WHM > MultiPHP Manager.

If it is turned on for the account, you can edit the directive by clicking on ‘Edit PHP-FPM’.

Scroll down and ‘Edit function list’ for Disabled functions (disable functions) field.

Delete the ‘exec’ item. And Save.

That’s it!