Matt Mullenweg posted to the WordPress.org blog that WordPress 3.0.4 is available, and he is asking users to please upgrade as soon as possible. The upgrade is entirely for security reasons. He describes it in the post:
Version 3.0.4 of WordPress, available immediately through the update page in your dashboard or for download here, is a very important update to apply to your sites as soon as possible because it fixes a core security bug in our HTML sanitation library, called KSES. I would rate this release as “critical.”
I realize an update during the holidays is no fun, but this one is worth putting down the eggnog for. In the spirit of the holidays, consider helping your friends as well.
If you need help on updating your WordPress please submit a work order here , and we will be happy to update it.

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