I recently found out that one of my Domains (which was only a empty Wordpress installation), was hacked. The website didn't show the wordpress installation anymore, instead there was just a website with some music that say "Hacked my Team_cc" and some more text.
I've now changed very passwords from any other website, because there are mulitple websites with different domains on the same server. But my question is now, since only one Domain was attacked, was it just a hole they found in the older Wordpress installation, or why weren't the other domains affected?
Is there a known bug in Wordpress 3.8 that allows users to get access to the files? How can I find out if they compromised FTP or ssh?
Best regards