WordPress versions 4.2.2 and earlier are affected by a cross-site scripting vulnerability, which could allow users with the Contributor or Author role to compromise a site. This was initially reported by Jon Cave and fixed by Robert Chapin, both of the WordPress security team, and later reported by Jouko Pynnönen.
We also fixed an issue where it was possible for a user with Subscriber permissions to create a draft through Quick Draft. Reported by Netanel Rubin from Check Point Software Technologies.
Our thanks to those who have practiced responsible disclosure of security issues.
Download WordPress 4.2.3 or venture over to Dashboard ? Updates and simply click “Update Now.” Sites that support automatic background updates are already beginning to update to WordPress 4.2.3.
Reposted from WordPress.org