WHMCS has been on spotlight for the past few weeks with multiple exploit being released to the public. The new one just released 1 hour ago which has the ability to exploit your user details.
To the client whom use WHMCS, we recommend to immediately shutdown their WHMCS/billing until you have gotten official patch by WHMCS.
As to the bennykusman.com/client, we are using ClientExec, which so far has been secured.
BK Web Solutions