Windows Local Security Authority (LSA) Elevation of Privilege Vulnerability

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker could use this vulnerability to elevate privileges from a Low Integrity Level in a contained ("sandboxed") execution environment to a Medium Integrity Level or a High Integrity Level.
Please refer to AppContainer isolation and Mandatory Integrity Control for more information.

How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by sending a specially crafted API call to the Local Security Authority AuthBroker. The attacker could use the vulnerability for a container "sandbox" escape to elevate privileges.

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?
This vulnerability could lead to a contained execution environment escape. Please refer to AppContainer Isolation for more information.

Security updates
10.0.17763.3532 — https://support.microsoft.com/help/5018419
10.0.19043.2130 — https://support.microsoft.com/help/5018410
10.0.20348.1129 — https://support.microsoft.com/help/5018421
10.0.22000.1098 — https://support.microsoft.com/help/5018418
10.0.22621.674 — https://support.microsoft.com/help/5018427