Release Notes: Some security issues were addressed, including one critical item. There is no new functionality. It is recommended that all users immediately upgrade their sites to the current release.
Release Notes: Minor fixes and updates were made. All admins are encouraged to upgrade.
Release Notes: Both versions include primarily fixes and patches. Users of 4.x and 3.x are encouraged to upgrade. 3.6 is the Long Term Support (LTS) version and will continue to receive patches, fixes, and security updates. 4.3 is the final release in the 4.x branch.
Release Notes: Bugfixes, feature polishing, and security updates. All users are strongly encouraged to update to the latest version to take advantage of security fixes and updates.