WordPress 4.3.1 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 three issues, including two cross-site scripting vulnerabilities and a potential privilege escalation.
WordPress versions 4.3 and earlier are vulnerable to a cross-site scripting vulnerability when processing shortcode tags (CVE-2015-5714).
A separate cross-site scripting vulnerability was found in the user list table.
Finally, in certain cases, users without proper permissions could publish private posts and make them sticky (CVE-2015-5715).Official Announcement