Updates to improve security when using Microsoft Office products. Updates to improve security when Windows performs basic operations. "In this update, we can see some vulnerabilities that are already being exploited and some that look ripe for exploitation in the future," Immersive Labs’ Kevin Breen, Director of Cyber Threat Research, said about today's security patches. "We have seen motivated attackers reproduce exploits within days of the patches being released, so, as always, it’s vital that you patch as quickly as possible to ensure your exposure is reduced." Here is the complete changelog of KB4598229 (Build 18363.1316) for Windows 10 v1909 and v1903