WHM Server Hacking Problem

Job ID: 35455455

Budget: €8 – €30 EUR

I have a whm Dedicated Server with multiple accounts and everyday i find a hacked website,

mostly changed Username / Password in users
Files in the Website changed
Links / etc

I constantly update all websites and passwords but i still have problem

Anybody know how to handle this in multiple account level ?
Related categories: PHP Linux WordPress MySQL Web Hosting