@GossiTheDog @wdormann @FritzAdalis @jernej__s There are now sites that say that you can safely delete the folder after installation of the kb.
My assumption is that the folder has been created to fix a possible vulnerability where a user can place a folder/file there to exploit a bug in another component and elevate privileges. I would leave it there.
@faebudo @GossiTheDog @wdormann @jernej__s
Either that or a previous update screwed up the inetpub perms and this patch was trying to fix it.