AppContainer in Windows 10 Gold, 1511, 1607, 1703 and 1709, Windows Server 2016 and Windows Server, version 1709 allows an elevation of privilege vulnerability due to the way constrained impersonations are handled, aka "Windows AppContainer Elevation Of Privilege Vulnerability".
https://www.exploit-db.com/exploits/44149/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0821