This security and maintenance release features 29 fixes and enhancements. Plus, it adds a number of security fixes—see the list below. These bugs affect WordPress versions 5.2.2 and earlier; version 5.2.3 fixes them, so you’ll want to upgrade. If you haven’t yet updated to 5.2, there are also updated versions of 5.1 and earlier that fix the bugs for you.
WordPress.org already started automatic background updates that do not require you to do anything, but it may take some time for them to get to your website. If it does not update automatically, either do it yourself (and don’t forget to make a full backup first!) or contact Dusk Owl for help.