Windows Installer in Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1 and RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and 1709, Windows Server 2016 and Windows Server, version 1709 allows an elevation of privilege vulnerability due to how input is sanitized, aka "Windows Installer Elevation of Privilege Vulnerability".
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0868