On August 6, 2014, WordPress 3.9.2 was released to the public and WordPress 3.8.4 was released as an automatic security update for WordPress 3.8.3.
This is a security update for all previous WordPress versions.
To download WordPress 3.8.4, update automatically from the Dashboard > Updates menu in your site's admin area or visit http://wordpress.org/download/release-archive/.
For step-by-step instructions on installing and updating WordPress:
If you are new to WordPress, we recommend that you begin with the following:
From the announcement post:
readme.html wp-admin/about.php wp-includes/ID3/getid3.lib.php wp-includes/class-IXR.php wp-includes/compat.php wp-includes/pluggable.php wp-includes/version.php wp-login.php