Magento is releasing new versions of Magento Commerce and Open Source to increase product security and functionality:
Magento Open Source and Commerce 2.2.3
Magento Open Source and Commerce 2.1.12
Magento Open Source and Commerce 2.0.18
Magento Open Source 126.96.36.199
Magento Commerce 188.8.131.52
SUPEE-10570 to patch earlier Magento 1.x versions
These releases contain almost 50 security changes that help close cross-site request forgery (CSRF), unauthorized data leak, and authenticated Admin user remote code execution vulnerabilities. These releases also support API changes implemented recently by USPS. Additionally, Magento Commerce and Open Source 2.2.3 introduce finer permissions for common cache management tasks. This enhancement enables qualified administrators to assign permissions for discrete cache management tasks such as flushing cache storage and refreshing cache types.
We strongly recommend that all merchants upgrade as soon as is reasonably possible.