On 2/27/2018, new versions of Magento Commerce and Magento Open Source were released, increasing 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 1.9.3.8
Magento Commerce 1.14.3.8 SUPEE-10570 to patch previous Magento 1.x versions These releases contain nearly 50 security-related changes that include closing cross-site request calls (CSRF), unauthorized data leaks, and authenticated remote code execution vulnerabilities by admin users. These releases also support API changes recently implemented by USPS. In addition, Magento Commerce and Open Source 2.2.3 provide finer-grained permission adjustments for common cache management tasks. This enhancement allows qualified administrators to assign permissions for individual cache management tasks, such as clearing cache memory and updating cache types.We recommend all customers upgrade their store as soon as possible.

More information about security updates:

Magento 2.x security updatesMagento 1.x and SUPEE-10570 security updates

To the complete Magento Open Source release informationen:

Magento Open Source 2.2.3
Magento Open Source 2.1.12
Magento Open Source 2.0.18
Magento Open Source 1.9.3.8

To the complete Magento Commerce release informationen:

Magento Commerce 2.2.3
Magento Commerce 2.1.12
Magento Commerce 2.0.18
Magento Commerce 1.9.3.8