MC1133897 – The August 2025 Windows security update is now available

Product:

SharePoint, Windows, Windows Server

Platform:

Online, Windows Desktop, World tenant

Status:

Change type:

Admin impact

Links:

Details:

The August 2025 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 and Windows 10 update history pages. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.

Highlights for the Windows 11, version 24H2 update:
This security update includes improvements that were a part of update KB5062660 (released July 22, 2025).
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
This update addresses security issues for your Windows operating system.
This update addresses an issue that caused long delays during sign-in on new devices.


Short on time? Watch our Windows 11 release notes video for this month's tips.


For instructions on how to install this update, see the KB for your operating system listed below:
Windows 11, version 24H2: KB5063878
Windows 11, versions 23H2 and 22H2: KB5063875
Windows 11 Enterprise LTSC 2024: Hotpatch KB5064010
Windows 10, versions 22H2 and 21H2: KB5063709
Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5063877
Windows 10 LTSB 2016 and Windows Server 2016: KB5063871
Windows 10 LTSB 2015: KB5063889
Windows Server 2025: KB5063878
Windows Server 2025 Datacenter: Azure Edition: Hotpatch KB5064010
Windows Server 2022: KB5063880
Windows Server 2022 Datacenter: Azure Edition: Hotpatch KB5063812
Windows Server 2012 R2: Monthly Rollup: KB5063950
Windows Server 2012: Monthly Rollup: KB5063906
Windows Server 2008 R2 Service Pack 1: Monthly Rollup: KB5063947 / Security Only: KB5063927
Windows Server 2008 SP2: Monthly Rollup: KB5063888 / Security Only: KB5063948

Change Category:
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Release Phase:

Created:
2025-08-13

updated:
2025-08-13

Task Type

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Docu to Check

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MS Preperations

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summary for non-techies**

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Direct effects for Operations**

Delayed Sign-In Issues
Failure to install the update may result in long delays during sign-in on new devices, impacting user productivity.
   - roles: End Users, IT Support
   - references: https://support.microsoft.com/help/5062660, https://support.microsoft.com/help/5063875

Security Vulnerabilities
Not applying the security update can leave systems exposed to security threats, potentially leading to data breaches.
   - roles: System Administrators, Security Officers
   - references: https://support.microsoft.com/help/5063709, https://support.microsoft.com/help/5063871

Service Disruption
Inadequate preparation for the update may cause service disruptions, affecting applications reliant on Windows Server.
   - roles: Application Administrators, End Users
   - references: https://support.microsoft.com/help/5063880, https://support.microsoft.com/help/5063947

Compatibility Issues
Skipping the update may lead to compatibility issues with other software, resulting in application failures.
   - roles: Software Developers, End Users
   - references: https://support.microsoft.com/help/5063878, https://support.microsoft.com/help/5063888

Increased Support Tickets
Failure to prepare for the update may lead to an increase in support tickets due to user issues, straining IT resources.
   - roles: IT Support, Help Desk Staff
   - references: https://support.microsoft.com/help/5063927, https://support.microsoft.com/help/5063950

Configutation Options**

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IT Security**

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explanation for non-techies**

Imagine your computer system as a house. Just like you need to lock your doors and windows to keep your home safe, your computer needs regular updates to protect it from potential threats. The August 2025 Windows security update is like adding new locks and reinforcing your doors. It ensures that any weaknesses or vulnerabilities in your system are addressed, making it harder for unwanted intruders, like viruses or hackers, to get in.

This update also includes improvements from a previous update, much like fixing a squeaky door hinge or a leaky faucet that was identified earlier. It makes your system run smoother and more efficiently. One of the key improvements is to the servicing stack, which is the part of your system responsible for installing updates. Think of it as upgrading your toolbox so that future repairs and enhancements can be done more effectively.

Additionally, this update fixes an issue that caused long delays during sign-in on new devices. It's like fixing a door that used to get stuck, making it easier and quicker to enter your house.

For those who prefer visual instructions, there's a video available that provides tips and guidance on the update. It's similar to watching a home improvement show to get ideas on how to enhance your living space.

To install the update, you can follow specific instructions provided for your version of Windows or Windows Server. This is akin to following a step-by-step guide to install a new security system in your home. Each version has its own set of instructions, much like different models of security systems require different installation processes.

By keeping your system updated, you're ensuring that your digital environment remains secure and efficient, just as regular maintenance keeps your home safe and comfortable.