This is from the http://WordPress.org website and it’s an URGENT update if you just upgraded to WordPress 2.1.1 like I did a couple of days ago.
http://wordpress.org/development/2007/03/upgrade-212/
Long story short: If you downloaded WordPress 2.1.1 within the past 3-4 days, your files may include a security exploit that was added by a cracker, and you should upgrade [...]



