I am working in web hosting company so my job is to fix clients problem, one of the biggest problem we are facing right now is that our only word press customer site got hacked 'not one all of them', and we have around 1200 word press customer that are hacked.
Most customer site's are up to date and they have around 4 to 5 security plugins, and we have tried every security plugins on the planet earth, and we have also tried manually editing the sites ( manually secure ). All other CMS are working fine like joomla and custom made site's.
How can we fix the hack issue ?
one of the shocking thing is that my site is on the same server and i haven’t got hacked !!. i have no security plugins installed but my wp-config.php file is in my home directory so its not in 'public_html' ( cpanel )