Microsoft browsers on Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow a spoofing vulnerability in the way they parse HTTP content, aka "Microsoft Browser Spoofing Vulnerability."
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8602
http://www.securitytracker.com/id/1038860