Recently a bug in certain versions of PHP came to our attention that could cause a security vulnerability in your blog. We’re able to work around it fairly easily, so we’ve decided to release 2.0.7 to fix the PHP security problem and the Feedburner issue that was in 2.0.6. It is recommended that everyone running WordPress 2.0.6 or lower upgrade to this new version.

WP Development Blog via BlogsNow