WordPress 4.2.2 is now available and should be applied to all your sites as soon as possible as it addresses two security issues, includes hardening for a potential cross-site scripting vulnerability when using the visual editor, and contains 13 bug fixes from 4.2.

You can read more about the update: https://wordpress.org/news/2015/05/wordpress-4-2-2/

You can download WordPress 4.2.2: http://wordpress.org/wordpress-4.2.2.zip