The WordPress core team has shipped version 4.2.3, which is a security and maintenance release for all previous versions of the core software.
WordPress 4.2.3 addresses 20 bugs found in version 4.2.2, as well as an XSS vulnerability which allows users with Contributor and Author access levels to compromise a site. This is an important update which goes all the way back to version 3.7.
All Pressjitsu customers have been automatically updated to version 4.2.3. There have been reports in the WordPress.org forums about the new version breaking compatibility with some plugins, which heavily rely on certain methods of shortcode processing. If you experience any trouble with such plugins, please open a support request via your Pressjitsu control panel.