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No software system is immune to bugs and vulnerabilities. Security holes will be discovered and bad guys will do their best to exploit them. Keeping your software up-to-date is a fantastic way to stave off attacks, once security holes are found because their products will be fixed by software vendors that are reliable.
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Do your homework and some about his hunting, but if you are pressed for time and need to get this try out the WordPress security plugin that I use. It's a relief to know that my site (and business!) are secure.