The WordPress Core Team has released version 4.2.4, which is a security and maintenance update. All WordPress users are encouraged to upgrade immediately.
WordPress 4.2.4 addresses three XSS vulnerabilities, a possible SQL injection and a few other minor issues found in previous versions of the core software. The full list of changes can be found in the core bug-tracker.
All Pressjitsu customers have been updated to version 4.2.4 automatically. If you spot any issues, please open a support request via your hosting control panel.