Microsoft has released the following Security Bulletin(s) for April 2017.https://technet.microsoft.com/en-us/security/default.aspx
Bulletin Summary: https://portal.msrc.microsoft.com/en-us/security-guidance/releasenotedetail/42b8fa28-9d09-e711-80d9-000d3a32fc99
The April 2017 security release consists of security updates for the following software:
Microsoft Office and Microsoft Office Services and Web Apps
Visual Studio for Mac
Adobe Flash Player
Please note the following information regarding the security updates:
Beginning with the October 2016 release, Microsoft is changing the update servicing model for Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2. For more information, please see this Microsoft Technet article https://blogs.technet.microsoft.com/windowsitpro/2016/08/15/further-simplifying-servicing-model-for-windows-7-and-windows-8-1/
Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog.
Starting in March 2017, there will be a Windows 10 1607 delta package that contains just the delta changes between the previous month and the current release.
Updates for Windows RT 8.1 and Microsoft Office RT software are only available via Windows Update.
In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
As a reminder, the Security Updates Guide will be replacing security bulletins https://portal.msrc.microsoft.com/en-us/security-guidance