Plesk 7.5 and prior and 7.6 for windows suffer from an information disclosure vulnerability in the file manager.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/50362/PLESK7.5-7.6.txt
Source: https://packetstormsecurity.com/files/50362/PLESK7.5-7.6.txt.html