WordPress 4.2.1 is now available. This is a critical security release for all previous versions and we strongly encourage you to update your sites immediately. April 27, 2015 the WordPress team was made aware of a cross-site scripting vulnerability, which could enable commenters to compromise a site.
- If you installed WordPress from the Plesk Panel Applications tab, you can upgrade it from the Panel
- If you installed WordPress yourself, login to your WordPress Admin Dashboard and upgrade it from there