WordPress 4.3.1 is now available for download. It is a security and maintenance release for all previous versions of WordPress. So it is recommended that you update all of your sites as soon as possible.
Issues fixed in this release,
- Cross-site scripting vulnerability when processing shortcode tags (CVE-2015-5714)
- Cross-site scripting vulnerability in the user list table
- Users without proper permissions could publish private posts and make them sticky (CVE-2015-5715) in some cases
This release also fixes 26 bugs from WordPress 4.3.
If you are already using 4.3 you site should automatically update to 4.3.1. If not you can manually update from your dashboard (Dashboard->Updates->Update Now).