Magento Patch Update: Introducing several security enhancements including PSD2-compliant core payment methods. It is strongly recommended that you upgrade your site to ensure you continue to benefit from the most up to date security compliance and performance.
This is the last update for Magento 2.2.* and no further updates will be released.
Enhancements to the message queue framework
Improved page caching and session storage
Enhanced support for MariaDB 10.2
NOTE: Core integration of the Authorize.net payment method has been deprecated. Please use the official payment integration that is available on Marketplace.
Various performance boosts have also been introduced which in conjunction with the security fixes provide even more incentive to upgrade.
Magento 2.3.4, 2.3.3-p1 Release notes
2.3.3-p1 Patch contains all the critical security only patches only, installion is forund here.
All Magento 2 upgrades should be installed by your developer and we strongly reccomend doing so as soon as possible.