Microsoft April 2019 Patch Tuesday's release included fixes for 74 vulnerabilities, 15 of which were classified as critical and most of which affect the Windows operating system itself and two actively exploited vulnerabilities.

The actively exploited vulnerabilities included two Win32K Elevation of Privilege vulnerabilities on of which was discovered by the Alibaba Cloud Intelligence Security Team and the other discovered by Kaspersky.

Both of the flaws can result in unauthorized elevation of privilege, and affect all supported versions of Windows although an attacker must already have local access to an affected system to use or gain kernel-level code execution capabilities.

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