Wordpress announced that the Wordpress v2.1.1 is corrupted and those who upgraded their sites to that version should upgrade the system to the v2.1.2 immediately.

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 all of your files to 2.1.2 immediately.

Wordpress explained that one of their servers has been successfully infiltrated by crackers who are responsible of modifying the original Wordpress v2.1.1 codes. According to the
Matt, the Wordpress code was modified three or four days ago.

So, what’s the lesson here? I think this incident tells me that it is safer if you will upgrade immediately your blog’s engine soon as the new version of the Wordpress has been made available.