If you have not updated your site yet – please make sure to read about the most recent WordPress update. The update contains important security updates and the update should be applied as soon as possible.

You can read more about the update: http://core.trac.wordpress.org/log/branches/3.6?stop_rev=24972&rev=25345

You can download WordPress 3.6.1: http://wordpress.org/wordpress-3.6.1.zip