Nice post with full information, here are also some of the updates.
This security update includes quality improvements. Key changes include:
Provides protection against Spectre Variant 2 (CVE-2017-5715) and Meltdown (CVE-2017-5754) for VIA-based computers. These protections are enabled by default for the Windows Client but disabled by default for Windows Server. For Windows Client (IT Pro) guidance, follow the instructions in KB4073119. For Windows Server guidance, follow the instructions in KB4072698. Use these guidance documents to enable or disable these mitigations for VIA-based computers.
Addresses an issue in which netdom.exe fails to run, and the error, “The command failed to complete successfully” appears.
Addresses an issue that may cause authentication issues for Internet Explorer 11 and other applications that use WININET.DLL. This occurs when two or more people use the same user account for multiple, concurrent login sessions on the same Windows Server machine, including Remote Desktop Protocol (RDP) and Terminal Server logons.
Addresses an issue that may cause a compound document (OLE) server applications to display embedded objects incorrectly if you use the PatBlt API to place embedded objects into the Windows Metafile (WMF).
Microsoft released new security updates today. Both Critical and Important Updates have been released. Updates include those for Microsoft Windows, Microsoft Edge, ASP Net, Internet Explorer, Exchange Server, ChakraCore, Adobe Flash, and others.
Microsoft Security Updates for April 9, 2019
Microsoft also released an updated version of the Microsoft Windows Malicious Software Removal Tool on Windows Update, Microsoft Update, Windows Server Update Services, and the Download Center.
April 2019 Security Update Release Notes
In addition, Microsoft released a number of updates for Microsoft Office in the link below.
April 2019 updates for Microsoft Office
Hope this helps.