If you upgraded to WordPress 2.1.1 in the past 3-4 days, download the new version (2.1.2) and update your blog again because your files may include a security exploit that was added by a cracker!
Only WordPress 2.1.1 seems to have been affected, so if you have not upgraded to WordPress 2.1.1 you should be fine. If your blog is running 2.1.1, please upgrade immediately and do a full overwrite of your old files.
For further details check out the WordPress blog.
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