Microsoft releases Windows 10 KB5122878 extended security update
Recorded: Sept. 8, 2026, 7:01 p.m.
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Microsoft releases Windows 10 KB5122878 extended security update News Featured Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Adobe fixes critical Magento zero-day exploited to backdoor servers ShinyHunters hackers claim breach of Florida "DAVID" DMV database August updates trigger 0xc0000409 errors on Windows Server 2016 Microsoft releases Windows 10 KB5122878 extended security update Microsoft September 2026 Patch Tuesday fixes 966 flaws, 2 zero-days Get an intro to the CISSP exam's 8 domains for $14.97 in this deal Windows 11 cumulative updates KB5124008 & KB5122880 released Tutorials Latest How to access the Dark Web using the Tor Browser How to enable Kernel-mode Hardware-enforced Stack Protection in Windows 11 How to use the Windows Registry Editor How to backup and restore the Windows Registry How to start Windows in Safe Mode How to remove a Trojan, Virus, Worm, or other Malware How to show hidden files in Windows 7 How to see hidden files in Windows Webinars Latest Qualys BrowserCheck STOPDecrypter AuroraDecrypter FilesLockerDecrypter AdwCleaner ComboFix RKill Junkware Removal Tool Deals Categories eLearning IT Certification Courses Gear + Gadgets Security VPNs Popular Best VPNs How to change IP address Access the dark web safely Best VPN for YouTube Forums Virus Removal Guides HomeNewsMicrosoftMicrosoft releases Windows 10 KB5122878 extended security update Microsoft releases Windows 10 KB5122878 extended security update By Lawrence Abrams September 8, 2026 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. Windows 10 KB5122878 updateSource: BleepingComputer [Secure Boot] This update includes additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Certificate deployment via Windows updates continues across supported PCs and non-managed business devices in the coming months. [Date and Time] This update adjusts Morocco Standard Time to reflect Morocco's transition to permanent UTC+00:00 effective September 20, 2026. This change ensures that the correct local time is displayed after the transition. [OMA DM protocol] This update improves the logging features of the OMA DM Client (omadmclient.exe) component. More debug information is now saved when connecting to a server. [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. [Remote Desktop] This update addresses an issue that affects Remote Desktop audio redirection. Audio from the remote session might not play on the local computer in certain configurations. [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. Microsoft says there are no known issues with this update. Once attackers have valid credentials, only 37% of their actions are blocked Overall prevention scores can hide what happens after initial access. Once attackers are using valid credentials, prevention drops sharply.The Blue Report 2026 measures defenses technique by technique across 338 million simulations run in customer production environments. Related Articles: Cumulative Update Lawrence Abrams Previous Article Post a Comment Community Rules You need to login in order to post a comment Not a member yet? Register Now You may also like: Upcoming Webinar Popular Stories OpenAI admits it didn't disclose rogue AI wiki hijacking incident BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations Over 5,400 hacked sites serve ClickFix payloads stored on the blockchain Sponsor Posts See how attackers exploit passkey enrollment, and why hardware-bound biometrics raise enterprise identity assurance. CTI Starter Kit + 2026 SANS CTI Survey Unify ransomware protection and recovery for every client Upcoming Webinar Follow us: Main Sections News Community Forums Useful Resources Welcome Guide Company About BleepingComputer Terms of Use - Privacy Policy - Ethics Statement - Affiliate Disclosure Copyright @ 2003 - 2026 Bleeping Computer® LLC - All Rights Reserved Login Username Password Remember Me Sign in anonymously Sign in with Twitter Not a member yet? Register Now Help us understand the problem. What is going on with this comment? Spam Abusive or Harmful Inappropriate content Strong language Other Read our posting guidelinese to learn what content is prohibited. Submitting... |
Microsoft has released the Windows 10 KB5122878 extended security update, which incorporates the fixes from the September 2026 Patch Tuesday and addresses several bug issues. This update serves primarily as a delivery mechanism for critical security enhancements and bug resolutions. Installation procedures vary slightly depending on the system configuration; users running Windows 10 Enterprise LTSC or those enrolled in the Extended Security Update program can install this update through the standard Settings menu by manually checking for updates. Upon installation, Windows 10 will be updated to build 19045.7725, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7725. The core content of the KB5122878 update is centered on security patches and bug fixes rather than introducing new features. A significant component of this release involves addressing a record-breaking set of flaws identified during the September 2026 Patch Tuesday, which fixed 966 vulnerabilities across Microsoft products, including two zero-day flaws that were actively being exploited. Specific technical improvements within the update include enhancements to Secure Boot, which increases the confidence level for device targeting data and expands coverage for devices eligible to automatically receive new Secure Boot certificates; this process contributes to ongoing certificate deployment across supported PCs and non-managed business devices. Furthermore, the update addresses a time synchronization issue by adjusting Morocco Standard Time to reflect its transition to permanent UTC+00:00, effective September 20, 2026. Other specific fixes detailed in the update involve system protocols and policies. The update improves the logging capabilities of the OMA DM Client component by saving more debug information when connecting to a server. Regarding application compatibility, the update refines Windows Code Integrity policies to improve application compatibility during the rotation of certificate authorities by recognizing Microsoft Windows Production PCA 2026 RSA2048-SHA256 as equivalent to PCA 2011. Additionally, the patch resolves an issue affecting Remote Desktop functionality related to audio redirection, ensuring that audio from remote sessions is correctly played on the local computer in various configurations. Finally, KB5122878 mitigates a known instability concerning BitLocker Group Policy, resolving an issue where devices with unrecommended BitLocker Group Policy configurations might require the entry of their recovery key. The author Lawrence Abrams, who is the owner and Editor in Chief of BleepingComputer.com, reported on these updates. |