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If you've been hacked, you need to take immediate action. It's not just a matter of losing or exposing sensitive data from your once-secure web site, which is in itself a big problem. Besides the data loss, you have to deal with this: You don't know what "trap doors" the hacker left behind. Your web site security is useless. So even if you change all your passwords and file permissions, the server could still be exposed. Do not -- repeat, do not -- continue using the server. If you are working with a hosting provider, the provider should inform you of the problem and what is being done about it. If you are on your own, consider bringing in a security consultant. This is a real problem. It can't be ignored.