Content complements of: https://wordpress.org/news/2015/08/wordpress-4-2-4-security-and-maintenance-release/
WordPress 4.2.4 is now available. This is a¬†security release¬†for all previous versions and we strongly encourage you to update your sites immediately.
This release addresses six issues, including three cross-site scripting vulnerabilities and a potential SQL injection that could be used to compromise a site, which were discovered by Marc-Alexandre Montpas of Sucuri, Helen Hou-Sand√≠ of the WordPress security team, Netanel Rubin of Check Point, and Ivan Grigorov. It also includes a fix for a potential timing side-channel attack, discovered by Johannes Schmitt of Scrutinizer, and prevents an attacker from locking a post from being edited, discovered by Mohamed A. Baset.
Our thanks to those who have practiced¬†responsible disclosure¬†of security issues.
WordPress 4.2.4 also fixes four¬†bugs.¬†For more information, see the¬†release notes¬†or consult the¬†list of changes.
Download WordPress 4.2.4¬†or venture over to Dashboard ‚Üí Updates and simply click ‚ÄúUpdate Now.‚ÄĚ Sites that support automatic background updates are already beginning to update to WordPress 4.2.4.
Already testing WordPress 4.3? The second¬†release candidate is now available (zip) and it contains these fixes. For more on 4.3, see¬†the RC¬†1 announcement post.