https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4515384-and-kb4512578-released-with-fixes/ > Microsoft is rolling out a new cumulative update to devices with Windows 10 May 2019 Update (version 1903), Windows 10 October 2018 Update (version 1809), and other supported versions with multiple fixes and improvements. > The September 2019 cumulative update for Windows 10 includes security enhancements for Internet Explorer, Microsoft Edge, and input devices such as a mouse, keyboard, or stylus.