WordPress 3.0.5 has been released writes Andrew Nacin on WordPress.org
This is a security release which fixes problems with untrusted user accounts, that could have allowed a Contributor- or Author-level user to gain further access to the site, and also comes with important security enhancements and hardening. All WordPress users are strongly advised to update.
Download and info: http://wordpress.org/news/2011/02/wordpress-3-0-5/
List of Files Revised from 3.0.4:
wp-includes/default-filters.php
wp-includes/version.php
wp-includes/pluggable.php
wp-includes/kses.php
wp-includes/script-loader.php
readme.html
wp-admin/includes/post.php
wp-admin/includes/update-core.php
wp-admin/includes/template.php
wp-admin/js/post.dev.js
wp-admin/js/post.js
wp-admin/async-upload.php
http://codex.wordpress.org/Version_3.0.5