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Good for you. one of my client's site was also hack. Maybe SQL injection, forgot to upgrade the protector module still using the old 2.+ version (stupid me).
Now I have upgraded all my protector modules to v3.1, I hope this will work and prevent those #OOPS#s from hacking my sites.
A new version is about to be release(2.0.17), I hope this will be a more secured XOOPS version.