WordPress 2.1.1 has an exploit built in, need to be updated.

If you have downloaded the latest WordPress 2.1.1 in the last 2-3 days, then it is likely that it may include an exploit that was built in by an unknown hacker. Somehow he got access to the server and changed the code. As a result, the attacker can take full control of your blog.

Immediately upgrade to WordPress 2.1.2.

The source of this news is in the official WordPress blog .