WordPress recently had a big spoofah. Some of the old and outdated versions got hacked. It wouldn't have been a big deal but some big size blogs got nailed with the smackdown including PopCrunch, and Robert Scoble's Scobleizer.
Don't worry here is an easy way to keep your WordPress safe and secure from all alarm:
That's it. If you keep up-to-date you should never have a problem with WordPress.