Right now there is a worm making its way around old, unpatched versions of WordPress. This particular worm, like many before it, is clever: it registers a user, uses a security bug (fixed earlier in the year) to allow evaluated code to be executed through the permalink structure, makes itself an admin, then uses JavaScript to hide itself when you look at users page, attempts to clean up after itself, then goes quiet so you never notice while it inserts hidden spam and malware into your old posts.
So question arise what is exactly required to protect our server from such issue, and how to keep wordpress secure ?
Wordpress site itself published article On 5th September 09 describing How to Keep WordPress Secure
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