This occurs when you enable Windows Defender Application Guard (WDAG) and you do not configure Network Isolation policies. Addresses an issue that affects Microsoft Edge IE mode.The titles of pop-up windows and tabs are wrong. Addresses an issue that affects Microsoft Edge when it is in IE Mode.Addresses graphical issues in games that use Microsoft D3D9 on some platforms.The graphics hardware stops working if the hardware does not have a native Direct3D 9 driver. Addresses an issue that affects Microsoft Direct3D 9 games.When you format these characters as bold, the width size is wrong. Addresses an issue that affects the font of three Chinese characters.The error message is, “The handle specified is invalid (0x80090301).” It cannot retrieve a Kerberos ticket on behalf of the user. Addresses an issue that affects the Microsoft Azure Active Directory (AAD) Application Proxy connector.Addresses an issue that causes an OS upgrade to stop responding, and then it fails.It raises the authentication level to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY instead of RPC_C_AUTHN_LEVEL_CONNECT if RPC_C_AUTHN_LEVEL_NONE is specified. Addresses a DCOM issue that affects the Remote Procedure Call Service (rpcss.exe).

This occurs if the authentication level is below Packet Integrity. It automatically raises the authentication level for all non-anonymous activation requests from DCOM clients to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY.

Addresses an issue that affects Distributed Component Object Model (DCOM) authentication hardening.

Addresses security issues for your Windows operating system.

These are the fixes and improvements coming to the next update of Windows 10: Update KB5019959 fixes and changes for Windows 10

Windows 10 19044