Moodle 3.3.1, 3.2.4 and 3.1.7 are now available via the usual open download channels: https://download.moodle.org or Git.
For those of you on our MoodleCloud hosting service, including Moodle for Free sites, we are aiming to upgrade your sites to 3.3.1 within the next 7 days.
In addition to a number of bug fixes and small improvements, security vulnerabilities have been discovered and fixed. We highly recommend that you upgrade your sites as soon as possible. Upgrading should be very straightforward. As per our usual policy, admins of all registered Moodle sites will be notified of security issue details directly via email and we'll publish details more widely in a week. Other details can be found in our notes for each release:
Version 3.1 (LTS) is currently supported for security fixes only. See releases page for more details.