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mskbMicrosoftKB5026370
HistoryMay 09, 2023 - 7:00 a.m.

May 9, 2023—KB5026370 (OS Build 20348.1726)

2023-05-0907:00:00
Microsoft
support.microsoft.com
111
windows
security update
kb5026370
firewall
application
performance
bug fixes
microsoft products
quality improvements
conhost.exe
directx
taskbar thumbnail
azureservice
mobile device management
windows defender application control
active directory federation services
local administrator password solution

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

7.6

Confidence

High

EPSS

0.529

Percentile

97.6%

May 9, 2023—KB5026370 (OS Build 20348.1726)

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows Server 2022, see its update history page. NoteFollow @WindowsUpdate to find out when new content is published to the Windows release health dashboard.

Improvements

This security update includes quality improvements. When you install this KB:

  • New! This update changes firewall settings. You can now configure application group rules.
  • This update addresses an issue that affects conhost.exe. It stops responding.
  • This update affects the Islamic Republic of Iran. The update supports the government’s daylight saving time change order from 2022.
  • This update addresses issues that affect the 32-bit version of Windows Calculator.
  • This update addresses an issue that affects apps that use DirectX on older Intel graphics drivers. You might receive an error from apphelp.dll.
  • The update addresses an issue that sends unexpected password expiration notices to users. This occurs when you set up an account to use “Smart Card is Required for Interactive Logon” and set “Enable rolling of expiring NTLM secrets”.
  • This update addresses an issue that affects Microsoft Edge IE mode. Pop-up windows open in the background instead of in the foreground.
  • This update addresses an issue that affects the software defined networking (SDN) virtual subnet. The delete operation creates an error. This stops the virtual subnet from being deleted.
  • The update addresses an issue that affects AzureService Fabric containers. This change is off by default. To enable the change, set Globals.RouteResolutionOrderConfig to TRUE. To propagate the value, move the primary node for VswitchService and SDNAPI. After you set the value, this change will apply to new and current network traffic routes.
  • This update addresses an issue that affects protected content. When you minimize a window that has protected content, the content displays when it should not. This occurs when you are using Taskbar Thumbnail Live Preview.
  • This update addresses an issue that affects mobile device management (MDM) customers. The issue stops you from printing. This occurs because of an exception.
  • This update addresses an issue that affects signed Windows Defender Application Control (WDAC) policies. They are not applied to the Secure Kernel. This occurs when you enable Secure Boot.
  • This update addresses an issue that affects the Windows Defender Application Control. The policy that blocks software using a hash rule might not stop the software from running.
  • This update addresses an Active Directory Federation Services (AD FS). You might need to retry authentication multiple times to sign in successfully.
  • This update addresses an issue that affects accounts that run the Set-AdfsCertificate command. The command fails. This occurs when an account does not have read permissions for the related Distributed Key Manager (DKM) container.
  • This update addresses a race condition in Windows Local Administrator Password Solution (LAPS). The Local Security Authority Subsystem Service (LSASS) might stop responding. This occurs when the system processes multiple local account operations at the same time. The access violation error code is 0xc0000005.
  • This update addresses an issue that affects the legacy Local Administrator Password Solution (LAPS) and the new Windows LAPS feature. They fail to manage the configured local account password. This occurs when you install the legacy LAPS .msi file after you have installed the April 11, 2023, Windows update on machines that have a legacy LAPS policy.
  • This update addresses an issue that affects SMB Direct. Endpoints might not be available on systems that use multi-byte character sets.
    If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.For more information about security vulnerabilities, please refer to the Security Update Guide and the May 2023 Security Updates.

Windows Server 2022 servicing stack update - 20348.1720

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

Known issues in this update

Microsoft is not currently aware of any issues with this update.

How to get this update

Before installing this updateMicrosoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.Install this update****Release Channel Available Next Step
Windows Update and Microsoft Update Yes None. This update will be downloaded and installed automatically from Windows Update.
Windows Update for Business Yes None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies.
Microsoft Update Catalog Yes To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS) Yes This update will automatically sync with WSUS if you configure Products and Classifications as follows:Product: Microsoft Server operating system-21H2Classification: Security Updates

If you want to remove the LCUTo remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command:DISM /online /get-packages.Running Windows Update Standalone Installer (wusa.exe) with the**/uninstall **switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File InformationFor a list of the files that are provided in this update, download the file information for cumulative update 5026370. For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 20348.1720.

CVSS2

2.1

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:N/A:N

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

7.6

Confidence

High

EPSS

0.529

Percentile

97.6%