An elevation of privilege vulnerability exists in the way that the StartTileData.dll handles file creation in protected locations, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1420, CVE-2019-1422.
https://www.zerodayinitiative.com/advisories/ZDI-19-978/
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1423