After installing February 2019 updates to your IIS Server, Windows Authentication in your web application may stop working. End-users may notice a delay and an authentication error following it. This...
Updated Jul 26, 2019
Version 3.0
Blog Post
KB4487026 is the corrective patch, true, according to its release notes (though it's from February--why are you making a point of mentioning it now?).
But you also cite that KB as the problem, even in the headline. I think you must have meant another KB, since it can't be both things.
BTW, please don't use "safelinks."