WordPress version 3.8.2 is now available for download. This new version is a security release. It is highly recommended you update your WordPress installation as soon as possible. This releases fixes a weakness that could let an attacker force their way into your site by forging authentication cookies as well as a number of other bug and security fixes.
You can read more about the update: http://core.trac.wordpress.org/query?status=closed&group=resolution&milestone=3.8.2
You can download WordPress 3.8.2: http://wordpress.org/wordpress-3.8.2.zip