The April security release consists of 67 CVEs, of which 24 are listed as Critical, 42 are rated Important and 1 is rated Moderate in severity. One is listed as being publicly known and none are listed as being under active attack.

The updates address Remote Code Execution, Information Disclosure, Denial of Service and Security Feature Bypass.

For more information about the updates released today, see Updates can be sorted by OS from the search box. Information about the update for Windows 10 is available at Windows 10 Update History

As usual, Dustin Childs has provided a closer look at some of the patches for this this month's Zero Day Initiative The April 2018 Security Update Review.
Release Notes