A worm affecting older versions of WordPress has been getting lots attention in recent days.  The worm takes advantage of a security flaw that allows it to register a new user, grant itself administrator privileges and wreak havoc with your permalink structure.

The good news is that, if you are running one of the two most recent releases of WordPress (2.8.4 is the most current), your site is not susceptible to this problem.  As such, there is no specific patch for this vulnerability other than to upgrade to the most current release.

The WordPress Blog has additional details on this worm, as well as an FAQ if you believe your site has been affected.