WordPress Releases Security Hardening Update

The WordPress project has announced the releases of WordPress 3.0.5. Dubbed as a security hardening release it is an essential update for those with any untrusted user accounts, but it also comes with other important security enhancements and hardening for all WordPress installations.
Two cross site scripting bugs have been squashed:

• Properly encode title used in Quick/Bulk Edit, and offer additional sanitization to various fields. Affects users of the Author or Contributor role.
• Preserve tag escaping in the tags meta box. Affects users of the Author or Contributor role.

Also included in 3.0.5 are two security enhancements one of which improves the security of any plugins which were not properly leveraging the WordPress security API.
All WordPress administrators are encouraged to upgrade to this latest version. You can update automatically from the Dashboard > Updates menu in your site’s admin area or download 3.0.5 directly