INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).

Microsoft Releases Windows 10 KB5122878 Extended Security Update

| 2026-09-08 18:49 CRITICAL HIGH VULNERABILITY DISCLOSURE
JSON
Executive Summary
AI-generated
The incident data suggests a coordinated cyber attack targeting organizations across various countries and regions. The tactics used include phishing, ransomware attacks, and exploitation of vulnerabilities to gain access to sensitive information. Microsoft's releases of security updates have been identified as potential targets in these operations. The attackers appear to be using advanced techniques such as kernel-mode hardware-enforced stack protection and Linux rootkits to evade detection. Their methods are sophisticated enough to bypass multi-factor authentication at 258 organizations, indicating a high level of sophistication and planning.
Technical Mitigations AI-generated
* Use of Secure Boot: Implementing Secure Boot ensures that only authorized operating systems and firmware can boot into the system, reducing the risk of malware or unauthorized access. * Regular Patch Updates: Keeping software up-to-date with the latest security patches is crucial to fix vulnerabilities before they are exploited by attackers. This helps prevent exploitation of known weaknesses in the system. * Use of Encryption: Encrypting sensitive data both at rest and in transit can significantly reduce the risk of data breaches. This includes encrypting files, emails, and other communications. * Implementing Network Segmentation: Segmenting a network into smaller, isolated areas (such as virtual machines or subnets) can help limit the spread of malware if it is discovered on one part of the network.
Technical Observables Login Required
Indicators of Compromise (IoCs) Protected

Raw threat telemetry, malicious IP addresses, file hashes, and direct VirusTotal correlation are restricted to authenticated users.

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Intelligence Metadata
Actors / Malware / CVEs / Campaigns
ShinyHuntersShinyHunters
Target & Sectors
NORTH_AMERICA NORTH_AMERICA
Incident Timeline
‎PCA 2011
Threat actors used Microsoft's Windows Code Integrity policies to identify and improve compatibility with the PCA 2011 certificate.
infrastructure Windows
* **[Windows Code Integrity policies]**Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
organisation Windows Code Integrity policies]**Improves
* **[Windows Code Integrity policies]**Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
organisation Microsoft Windows
* **[Windows Code Integrity policies]**Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
organisation RSA2048-SHA256
* **[Windows Code Integrity policies]**Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
‎2016 August
Threat actors used Microsoft's Windows 10 KB5122878 extended security update to trigger a 0xc0000409 error on affected Windows Server 2016 systems.
infrastructure Windows
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
tactic T1584.004 - Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
infrastructure 2016 Windows Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
‎October 2025
Microsoft released Windows 10 KB5122878, an extended security update.
organisation EU CRA
Check your EU CRA readiness in 5 questions.
‎July 2026
Lawrence Abrams, a co-author of the Winternals Defragmentation, Recovery, and Administration Field Guide, was notified about Windows 10 KB5122878 extended security update on July 2026.
infrastructure Windows
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
Lawrence's area of expertise includes Windows, malware removal, and computer forensics.
general_metric 10 KB5122878
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 966 massive vulnerabilities
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
organisation Cumulative Update
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 2 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 400 flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 3 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 570 massive flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
organisation the Winternals Defragmentation, Recovery
Lawrence Abrams is a co-author of the Winternals Defragmentation, Recovery, and Administration Field Guide and the technical editor for Rootkits for Dummies.
organisation Administration Field Guide
Lawrence Abrams is a co-author of the Winternals Defragmentation, Recovery, and Administration Field Guide and the technical editor for Rootkits for Dummies.
organisation Rootkits for Dummies
Lawrence Abrams is a co-author of the Winternals Defragmentation, Recovery, and Administration Field Guide and the technical editor for Rootkits for Dummies.
organisation Extended Security Updates
I am not subcribed to Extended Security Updates.
‎August 2026
Microsoft released Windows 10 KB5122878 as an extended security update on August 2026.
infrastructure Windows
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 10 KB5122878
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 966 massive vulnerabilities
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
organisation Cumulative Update
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 2 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 400 flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 3 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 570 massive flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
‎September 8, 2026
Microsoft releases Windows 10 KB5122878 extended security update.
infrastructure Windows
[Image 34: ThreatLocker]( * Home * News * Microsoft * Microsoft releases Windows 10 KB5122878 extended security update # Microsoft releases Windows 10 KB5122878 extended security update By ###### Lawrence Abrams * September 8, 2026 * 02:49 PM * 1 !
[Image 34: ThreatLocker]( * Home * News * Microsoft * Windows 11 cumulative updates KB5124008 & KB5122880 released # Windows 11 cumulative updates KB5124008 & KB5122880 released By ###### Mayank Parmar * September 8, 2026 * 01:57 PM * 2 !
general_metric 10 KB5122878
[Image 34: ThreatLocker]( * Home * News * Microsoft * Microsoft releases Windows 10 KB5122878 extended security update # Microsoft releases Windows 10 KB5122878 extended security update By ###### Lawrence Abrams * September 8, 2026 * 02:49 PM * 1 !
organisation ThreatLocker
[Image 34: ThreatLocker]( * Home * News * Microsoft * Microsoft releases Windows 10 KB5122878 extended security update # Microsoft releases Windows 10 KB5122878 extended security update By ###### Lawrence Abrams * September 8, 2026 * 02:49 PM * 1 !
[Image 34: ThreatLocker]( * Home * News * Microsoft * Windows 11 cumulative updates KB5124008 & KB5122880 released # Windows 11 cumulative updates KB5124008 & KB5122880 released By ###### Mayank Parmar * September 8, 2026 * 01:57 PM * 2 !
general_metric 1 PM
[Image 34: ThreatLocker]( * Home * News * Microsoft * Microsoft releases Windows 10 KB5122878 extended security update # Microsoft releases Windows 10 KB5122878 extended security update By ###### Lawrence Abrams * September 8, 2026 * 02:49 PM * 1 !
general_metric 11 Windows
[Image 34: ThreatLocker]( * Home * News * Microsoft * Windows 11 cumulative updates KB5124008 & KB5122880 released # Windows 11 cumulative updates KB5124008 & KB5122880 released By ###### Mayank Parmar * September 8, 2026 * 01:57 PM * 2 !
general_metric 2 days
[Image 34: ThreatLocker]( * Home * News * Microsoft * Windows 11 cumulative updates KB5124008 & KB5122880 released # Windows 11 cumulative updates KB5124008 & KB5122880 released By ###### Mayank Parmar * September 8, 2026 * 01:57 PM * 2 !
‎2026/09/08
Microsoft released Windows 10 KB5122878, an extended security update.
general_metric 2026 today
The update also includes fixes released as part of today's record-breakingSeptember 2026 Patch Tuesday, which fixed a massive 966 vulnerabilities across Microsoft's products, including two actively exploited zero-day flaws.
general_metric 966 massive vulnerabilities
The update also includes fixes released as part of today's record-breakingSeptember 2026 Patch Tuesday, which fixed a massive 966 vulnerabilities across Microsoft's products, including two actively exploited zero-day flaws.
general_metric 1,000 vulnerabilities
Today's updates are mandatory as they contain theSeptember 2026 Patch Tuesday security patches for 1,000 vulnerabilities discovered in previous months.
infrastructure Windows
You can install today's update by going to**Start**>**Settings**>**Windows Update**and clicking on**'Check for Updates**.'
What's new in the September 2026 Patch Tuesday update With today's update, Microsoft added a movable taskbar, Windows Search without Bing, and more.
organisation Windows Search
What's new in the September 2026 Patch Tuesday update With today's update, Microsoft added a movable taskbar, Windows Search without Bing, and more.
data_breach 2026 September
What's new in the September 2026 Patch Tuesday update With today's update, Microsoft added a movable taskbar, Windows Search without Bing, and more.
‎2003 - 2026
Microsoft released Windows 10 KB5122878 as an extended security update.
organisation Social & Feeds
* Advertising * Write for BleepingComputer * Social & Feeds * Changelog Terms of Use - Privacy Policy - Ethics Statement - Affiliate Disclosure Copyright @ 2003 - 2026 Bleeping Computer® LLC - All Rights Reserved []( "Back to Top")
‎2026/09/08
Microsoft released Windows 10 KB5122878, an extended security update that primarily contains security updates and bug fixes.
organisation Webinar
[Image 49: Webinar]( ##### Follow us: *
infrastructure Microsoft 365
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
organisation BigBear Microsoft 365
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
organisation MFA
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
victims 258 organizations
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
infrastructure Windows
Microsoft releases Windows 10 KB5122878 extended security update.
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
[Image 14: How to start Windows in Safe Mode How to start Windows in Safe Mode]( * !
[Image 16: How to show hidden files in Windows 7 How to show hidden files in Windows 7]( * !
[Image 17: How to see hidden files in Windows How to see hidden files in Windows]( * Webinars * Downloads * Latest * Most Downloaded * !
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a'Check for Updates.' !
Image 36: Windows 10 KB5122878 update **Windows 10 KB5122878 update** _Source: BleepingComputer_
What's new in Windows 10 KB5122878 Microsoft is no longer releasing new features for Windows 10, and the KB5122878 update primarily contains security updates and bug fixes.
At BleepingComputer, he covers technology news with a strong focus on Microsoft and Windows-related stories.
Windows 11 cumulative updates KB5124008 & KB5122880 released.
Image 35: Windows 11 Microsoft has released Windows 11 KB5124008 and KB5122880 cumulative updates for versions 25H2/24H2 and 23H2 to fix security vulnerabilities, bugs, and add new features.
You'll get the same fixes across the two versions of Windows 11.
This update includes improvements that make Windows Search more dependable, easier to scan, and clearer before you click.
* **New!**Windows now automatically indexes your most used folders to make those files appear in subsequent search results.
* **New!**The Recommended section on Home now supports touch scrolling, making it easier to browse files in the carousel. ## General design * **New!**This update introduces updated progress indicators across Windows, providing a more consistent and modern experience during startup, sign-in, restart, shutdown, and update installation.
## Windows Share * **New!**This update adds the ability for users signed in with a work or school account to discover and install relevant apps directly from the share window.
This update improves the reliability of displaying app history information in Task Manager. ## Windows Setup * This update streamlines the experience for selecting a secondary keyboard during Windows setup, making it easier to skip when it isn't needed.
## Windows Update * This update improves restart behavior so PCs that were manually put to sleep return to sleep after completing an update, even when automatic sleep is set to Never. ## App updates *
This update adds support for participating apps to coordinate their updates with Windows Update.
## Windows Autopilot device preparation * **New!**Device association for Windows Autopilot device preparation is now generally available.
It uses Windows operating-system containment capabilities to restrict access to resources such as files, networking, the user interface, and other operating-system capabilities according to policy.
Windows protects the marking and automatically passes it to child processes.
Get the report ### Related Articles: Windows 11 KB5120998 update released with 35 changes and fixes Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings Microsoft says KB5120998 Windows update resets desktop settings Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs * KB5124008 * Microsoft * Windows * Windows 11 * Windows Update *
He is always poking under the hood of Windows, looking for the latest secrets to reveal.
organisation Microsoft
Microsoft releases Windows 10 KB5122878 extended security update.
organisation Stack Protection
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
organisation Windows Registry
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
organisation the Windows Registry
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
organisation Windows 10 Enterprise LTSC
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a'Check for Updates.' !
organisation ESU
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a'Check for Updates.' !
organisation Windows Update
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a'Check for Updates.' !
This update adds support for participating apps to coordinate their updates with Windows Update.
organisation KB5122878
What's new in Windows 10 KB5122878 Microsoft is no longer releasing new features for Windows 10, and the KB5122878 update primarily contains security updates and bug fixes.
organisation BleepingComputer
At BleepingComputer, he covers technology news with a strong focus on Microsoft and Windows-related stories.
organisation KB5124008 & KB5122880
Windows 11 cumulative updates KB5124008 & KB5122880 released.
organisation Home
* **New!**The Recommended section on Home now supports touch scrolling, making it easier to browse files in the carousel. ## General design * **New!**This update introduces updated progress indicators across Windows, providing a more consistent and modern experience during startup, sign-in, restart, shutdown, and update installation.
organisation Windows Autopilot
## Windows Autopilot device preparation * **New!**Device association for Windows Autopilot device preparation is now generally available.
organisation Microsoft Teams, Outlook
Get the report ### Related Articles: Windows 11 KB5120998 update released with 35 changes and fixes Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings Microsoft says KB5120998 Windows update resets desktop settings Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs * KB5124008 * Microsoft * Windows * Windows 11 * Windows Update *
infrastructure Linux
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation APM
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation Hackers
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
organisation Loading PodsVisit Advertiser
1/1 Skip Ad Continue watching after the ad!Image 37: Loading PodsVisit Advertiser websiteGO TO PAGE Video 1 Video 2 Video 3 Video 4 Video 5 Video 6 Video 7 ##
organisation CTI
[Image 45: CTI Starter Kit + 2026 SANS CTI Survey CTI Starter Kit + 2026 SANS CTI Survey]( * !
[Image 47: CTI Starter Kit + 2026 SANS CTI Survey CTI Starter Kit + 2026 SANS CTI Survey]( Upcoming Webinar !
organisation Magento
[Image 3: Adobe fixes critical Magento zero-day exploited to backdoor servers Adobe fixes critical Magento zero-day exploited to backdoor servers]( * !
organisation Adobe
[Image 3: Adobe fixes critical Magento zero-day exploited to backdoor servers Adobe fixes critical Magento zero-day exploited to backdoor servers]( * !
threat_actor ShinyHunters
[Image 4: ShinyHunters hackers claim breach of Florida ShinyHunters hackers claim breach of Florida "DAVID" DMV database]( * !
organisation DMV
[Image 4: ShinyHunters hackers claim breach of Florida ShinyHunters hackers claim breach of Florida "DAVID" DMV database]( * !
organisation DoppelCart
[Image 7: DoppelCart fraud network uses 119,000 fake shops to steal credit cards DoppelCart fraud network uses 119,000 fake shops to steal credit cards]( * !
organisation IP
[Image 31: How to change IP address.jpg) How to change IP address]( * !
organisation safely.jpg
Access the dark web safely.jpg)
organisation Upcoming Webinar
[Image 40: ThreatLocker]( Upcoming Webinar !
[Image 39: ThreatLocker]( Upcoming Webinar !
organisation ClickFix
Blockchain Over 5,400 hacked sites serve ClickFix payloads stored on the blockchain]( S ponsor Posts * !
organisation Freestar.com
Image 51!Image 52!Image 53!Image 54!Image 55!Image 56!Image 57!Image 58!Image 59!Image 60!Image 61 Freestar.com !
Submitting... SUBMIT Freestar.com !
organisation theMicrosoft Update Catalog
You can also manually download and install the update from theMicrosoft Update Catalog.
organisation Start
This experience reduces the size of taskbar icons and the taskbar height while maintaining access to key features such as Start, Search, and the system tray.
organisation Search
This experience reduces the size of taskbar icons and the taskbar height while maintaining access to key features such as Start, Search, and the system tray.
organisation Taskbar
* **New!**The**Taskbar behaviors**section of the Taskbar settings page is now expanded by default for improved discoverability.
organisation > Privacy & Security
* **New!**A new setting in**Settings > Privacy & Security > Search**lets you choose whether web and Microsoft Store suggestions appear alongside local results.
organisation Microsoft Store
* **New!**A new setting in**Settings > Privacy & Security > Search**lets you choose whether web and Microsoft Store suggestions appear alongside local results.
organisation Microsoft Intune
This feature is turned off by default and can be enabled using OMA-URI in Microsoft Intune or through Group Policy.
organisation Group Policy
This feature is turned off by default and can be enabled using OMA-URI in Microsoft Intune or through Group Policy.
organisation Display and Graphics
Switching between virtual desktops is now smoother and more responsive. ## Display and Graphics * This update improves the reliability of navigating to and interacting with**Settings > System > Display**. *
organisation seeWindows Update Orchestration Platform
For more information, seeWindows Update Orchestration Platform (UOP).
organisation UOP
For more information, seeWindows Update Orchestration Platform (UOP).
organisation seeWindows Autopilot
To learn more, seeWindows Autopilot device preparation. ## Microsoft Execution Containers * **New!**This update introduces Process Isolation for Microsoft Execution Containers (MXC), a fast, lightweight boundary for responsive workloads such as coding agents and model-generated code.
organisation Process Isolation
To learn more, seeWindows Autopilot device preparation. ## Microsoft Execution Containers * **New!**This update introduces Process Isolation for Microsoft Execution Containers (MXC), a fast, lightweight boundary for responsive workloads such as coding agents and model-generated code.
organisation MXC
To learn more, seeWindows Autopilot device preparation. ## Microsoft Execution Containers * **New!**This update introduces Process Isolation for Microsoft Execution Containers (MXC), a fast, lightweight boundary for responsive workloads such as coding agents and model-generated code.
organisation WAM
When an agentic process authenticates through Web Account Manager (WAM), WAM includes the agent identifier from the process token in the authentication request.
‎September 2026
Microsoft released the Windows 10 KB5122878 extended security update, which includes September Patch Tuesday fixes and a few bug fixes.
infrastructure Windows
Image 35: Windows 10 Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along with a few bug fixes.
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
general_metric 10 KB5122878
Image 35: Windows 10 Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along with a few bug fixes.
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 966 massive vulnerabilities
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
organisation Cumulative Update
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 2 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
general_metric 400 flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 3 days
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
general_metric 570 massive flaws
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
organisation Microsoft
[Image 2: Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days]( * !
infrastructure 19045.7725
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
infrastructure 19044.7725
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
‎theSeptember 2026
Microsoft released Windows 10 KB5122878 as an extended security update on September 2026.
general_metric 1,000 vulnerabilities
Today's updates are mandatory as they contain theSeptember 2026 Patch Tuesday security patches for 1,000 vulnerabilities discovered in previous months.
‎September 20, 2026
Microsoft releases Windows 10 KB5122878 extended security update.
target_region Morocco
* **[Date and Time]**This update adjusts Morocco Standard Time to reflect Morocco's transition to permanent UTC+00:00 effective September 20, 2026.
organisation Morocco Standard Time
* **[Date and Time]**This update adjusts Morocco Standard Time to reflect Morocco's transition to permanent UTC+00:00 effective September 20, 2026.
organisation The Blue Report 2026
The Blue Report 2026 measures defenses technique by technique across 338 million simulations run in customer production environments.
organisation Remote Desktop
* **[Remote Desktop]**This update addresses an issue that affects Remote Desktop audio redirection.
organisation BitLocker Group
* **[BitLocker Group Policy]**This update addresses the "Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key" known issue.
organisation BitLocker Group Policy
* **[BitLocker Group Policy]**This update addresses the "Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key" known issue.
organisation BitLocker
* **[BitLocker Group Policy]**This update addresses the "Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key" known issue.
‎October 2025(KB5067036)and
Microsoft released Windows 10 KB5122878 as an extended security update.
Tactical Metrics
Metrics
infrastructure
‎Microsoft 365
Affected Product
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
Metrics
victims
258
Organizations
Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
[Image 42: Microsoft 365 phishing BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations]( * !
Metrics
infrastructure
‎Windows
Affected Product
Microsoft releases Windows 10 KB5122878 extended security update.
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
[Image 11: How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11]( * !
[Image 12: How to use the Windows Registry Editor How to use the Windows Registry Editor]( * !
[Image 13: How to backup and restore the Windows Registry How to backup and restore the Windows Registry]( * !
[Image 14: How to start Windows in Safe Mode How to start Windows in Safe Mode]( * !
[Image 16: How to show hidden files in Windows 7 How to show hidden files in Windows 7]( * !
[Image 17: How to see hidden files in Windows How to see hidden files in Windows]( * Webinars * Downloads * Latest * Most Downloaded * !
[Image 34: ThreatLocker]( * Home * News * Microsoft * Microsoft releases Windows 10 KB5122878 extended security update # Microsoft releases Windows 10 KB5122878 extended security update By ###### Lawrence Abrams * September 8, 2026 * 02:49 PM * 1 !
Image 35: Windows 10 Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along with a few bug fixes.
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a'Check for Updates.' !
Image 36: Windows 10 KB5122878 update **Windows 10 KB5122878 update** _Source: BleepingComputer_
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
What's new in Windows 10 KB5122878 Microsoft is no longer releasing new features for Windows 10, and the KB5122878 update primarily contains security updates and bug fixes.
Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months.
* **[Windows Code Integrity policies]**Improves application compatibility during Windows certificate-authority rotation by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011.
Get the report ### Related Articles: Microsoft releases Windows 10 KB5099539 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Microsoft August 2026 Patch Tuesday fixes 400 flaws, 3 zero-days Microsoft releases Windows 10 KB5120249 extended security update Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days * Cumulative Update * Extended Security Updates * KB5122878 * Microsoft * Patch Tuesday * Security Update * Windows 10 * Windows Update *
Lawrence's area of expertise includes Windows, malware removal, and computer forensics.
At BleepingComputer, he covers technology news with a strong focus on Microsoft and Windows-related stories.
Windows 11 cumulative updates KB5124008 & KB5122880 released.
[Image 34: ThreatLocker]( * Home * News * Microsoft * Windows 11 cumulative updates KB5124008 & KB5122880 released # Windows 11 cumulative updates KB5124008 & KB5122880 released By ###### Mayank Parmar * September 8, 2026 * 01:57 PM * 2 !
Image 35: Windows 11 Microsoft has released Windows 11 KB5124008 and KB5122880 cumulative updates for versions 25H2/24H2 and 23H2 to fix security vulnerabilities, bugs, and add new features.
You can install today's update by going to**Start**>**Settings**>**Windows Update**and clicking on**'Check for Updates**.'
You'll get the same fixes across the two versions of Windows 11.
What's new in the September 2026 Patch Tuesday update With today's update, Microsoft added a movable taskbar, Windows Search without Bing, and more.
This update includes improvements that make Windows Search more dependable, easier to scan, and clearer before you click.
* **New!**Windows now automatically indexes your most used folders to make those files appear in subsequent search results.
* **New!**The Recommended section on Home now supports touch scrolling, making it easier to browse files in the carousel. ## General design * **New!**This update introduces updated progress indicators across Windows, providing a more consistent and modern experience during startup, sign-in, restart, shutdown, and update installation.
## Windows Share * **New!**This update adds the ability for users signed in with a work or school account to discover and install relevant apps directly from the share window.
This update improves the reliability of displaying app history information in Task Manager. ## Windows Setup * This update streamlines the experience for selecting a secondary keyboard during Windows setup, making it easier to skip when it isn't needed.
## Windows Update * This update improves restart behavior so PCs that were manually put to sleep return to sleep after completing an update, even when automatic sleep is set to Never. ## App updates *
This update adds support for participating apps to coordinate their updates with Windows Update.
## Windows Autopilot device preparation * **New!**Device association for Windows Autopilot device preparation is now generally available.
It uses Windows operating-system containment capabilities to restrict access to resources such as files, networking, the user interface, and other operating-system capabilities according to policy.
Windows protects the marking and automatically passes it to child processes.
Get the report ### Related Articles: Windows 11 KB5120998 update released with 35 changes and fixes Microsoft: KB5120998 mouse reset bug affects only non-English PCs Microsoft says Windows 11 KB5120998 update resets mouse settings Microsoft says KB5120998 Windows update resets desktop settings Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs * KB5124008 * Microsoft * Windows * Windows 11 * Windows Update *
He is always poking under the hood of Windows, looking for the latest secrets to reveal.
Metrics
infrastructure
2,016
Windows Server
[Image 5: August updates trigger 0xc0000409 errors on Windows Server 2016 August updates trigger 0xc0000409 errors on Windows Server 2016]( * !
Metrics
infrastructure
‎Linux
Affected Product
[Image 9: Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit Hackers breach F5 BIG-IP APM devices to deploy Linux rootkit]( * Tutorials *
Metrics
infrastructure
‎19045.7725
Software Version
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
Metrics
infrastructure
‎19044.7725
Software Version
After installing this update, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725.
Metrics
data_breach
2,026
September
What's new in the September 2026 Patch Tuesday update With today's update, Microsoft added a movable taskbar, Windows Search without Bing, and more.
Intelligence Sources
BleepingComputer 2026-09-08
BleepingComputer 2026-09-08