Windows 7-10 updated. Patches between 3 and 7 dozen vulnerabilities depending on OS and version.
Windows 7
April 14, 2020—KB4550965 (Security-only update)
April 14, 2020—KB4550964 (Monthly Rollup)
Windows 8.1
April 14, 2020—KB4550970 (Security-only update)
April 14, 2020—KB4550961 (Monthly Rollup)
Windows 10
1909 & 1903 – April 14, 2020—KB4549951 (OS Builds 18362.778 and 18363.778)
1809 – April 14, 2020—KB4549949 (OS Build 17763.1158)
Security Update Guide > Release Notes > April 2020 Security Updates