If you have downloaded the WordPress within the last 3-4 days, you better upgrade your WP to 2.1.2. Because WordPress reports that someone had accessed their server and modified the download files, so now the 2.1.1 version allows remote PHP execution. That means that any site or blog that runs on WP 2.1.1 has a vulnerability and can easily be hacked.
To download WordPress version 2.1.2 go to http://wordpress.org/download/
