yet another Microsoft 10 Build 1903 Out-of-Band emergency update

 A rare out-of-band emergency update for Microsoft Windows 10 build 1903 was released September 23. "Seekers", those who check Windows Update often had the ability to obtain and apply the update.
 After the cyber security SIG meeting today, our return home saw yet another out-of-band emergency update.
The update is for Internet Explorer. Though you may not use Internet Explorer in favour of other browsers, other apps and malware designed to take advantage of this flaw can and will use Internet Explorer.
 It is important to reboot/restart systems after these two emergency updates even though the update process does not by default.