The vulnerability affects Windows 7, Windows 10 and Windows Server 2012 R2.
This wouldn’t be an issue if it weren’t for the disclosure of the flaw. Page posted details of the exploit after Microsoft reportedly declined to roll out an urgent security fix. It instead said a fix would be “considered” in a future release. While that does suggest a patch is on the way, it leaves millions of users potentially vulnerable unless they either turn off Internet Explorer or point to another app that can open MHT files.