Microsoft is rolling out Windows 10 build 18363.418 as update KB4517389 for devices enrolled in the Release Preview ring of the Windows Insider Program. This is the preview number 16 available to testers, and it’s releasing as a minor update.
Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization.
Security updates to Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server.
Other than those fixes, there’s nothing new with this update. You can check all the new features and improvements that Microsoft is planning to roll out in coming days in this guide.