Device Guard in Microsoft Windows 10 Gold, 1511, 1607, and Windows Server 2016 allows remote attackers to modify PowerShell script without invalidating associated signatures, aka "PowerShell Security Feature Bypass Vulnerability."
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0007
https://enigma0x3.net/2017/04/03/defeating-device-guard-a-look-into-cve-2017-0007/