Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 allows local users to bypass the Secure Boot protection mechanism by leveraging administrative access to install a crafted policy, aka "Secure Boot Security Feature Bypass."
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-094