cumulative updates Archives

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September 24, 2026

Microsoft: September Windows updates break Always On VPN connections

Microsoft has informed IT administrators about potential connection challenges with the Always On VPN after the September 2026 Windows 11 security updates. Users may face difficulties connecting to their organization's network, particularly if the VPN is set to automatically attempt an alternative connection method upon failure. Symptoms include connections remaining in a 'Connecting' state or displaying the error message: 'The specified port is already in use.' Affected versions include Windows 11, version 26H1 (KB5124012), version 25H2 (KB5124008), and version 24H2 (KB5124008). A temporary workaround involves adjusting the Always On VPN profile from automatic protocol selection to a single protocol (SSTP or IKEv2). Microsoft is also addressing various other issues related to Hyper-V, Remote Desktop Services, USB audio, and the File History backup feature.

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September 21, 2026

Microsoft: September updates break File History backup feature

Microsoft has issued a caution regarding the File History backup feature in Windows, indicating potential functionality issues on certain systems after installing the September 2026 security updates. Users may experience application crashes related to FileHistory.exe and KERNELBASE.dll, and may be unable to create or update backups. Misleading messages such as “Reconnect your drive” may appear, and the “Last Backup” timestamp may fail to update. Affected Windows versions include Windows 10 21H2 or later, Windows 10 Enterprise LTSC 2016/2019, and Windows 11 23H2 and later. Microsoft has acknowledged ongoing issues related to the September 2026 updates and is working on solutions.

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September 17, 2026

Microsoft Confirms Windows 11 Speed Fixes Are Coming to All Users

Windows 11 users have experienced delays in File Explorer and the Start menu since the operating system's launch in 2021. Recent reports from Windows Insiders indicate significant improvements in system responsiveness, confirmed by Marcus Ash from Microsoft, who stated that these enhancements will be rolled out to all users by fall 2026. Recent cumulative updates have addressed issues like File Explorer lag and Start menu stuttering, with specific updates (KB5120998, KB5095093, and KB5089573) improving responsiveness and reducing micro-stutters. Enhancements to the taskbar, Start menu, and context menus are also being developed, including taskbar repositioning and streamlined context menus. Users on the 25H2 version can expect these improvements through cumulative updates before the 26H2 update this fall. Keeping Windows Update active will ensure access to these enhancements.

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September 16, 2026

Microsoft built a local PC-to-PC transfer tool for Windows 11, now it’s killing it to push OneDrive-based solution

Microsoft has discontinued its PC-to-PC transfer tool for Windows 11, which allowed file transfers over Wi-Fi or LAN without using OneDrive. The company has shifted its focus to the Windows Backup solution that relies on OneDrive for file storage. Users must now restore backups linked to their Microsoft accounts and retrieve synced files via OneDrive, which has a 5GB storage limit for free accounts. The PC-to-PC transfer tool, tested in July 2025, enabled users to transfer documents, photos, videos, and user settings locally, but did not support the transfer of saved passwords, credentials, or installed applications.

Winsage

September 11, 2026

Microsoft fixes Teams, Outlook launch failures on ARM Windows PCs

Microsoft addressed a significant bug that affected the launch of Teams and Outlook on ARM-based Windows devices after updates from the August 2026 Patch Tuesday. The issue primarily impacted users of devices like the Surface Pro 11 and Surface Laptop 7 running Windows 11 24H2 or later, who had not installed necessary updates from the Microsoft Store. The bug caused Teams and Outlook to fail to launch or close unexpectedly following the installation of security updates released on or after August 11, 2026 (KB5121003). Classic versions of Outlook and other applications were not affected. A temporary workaround was suggested, involving updating the Auto Super Resolution Package. The bug was resolved through cumulative updates released on September 8, 2026 (KB5124012), and users were urged to install the latest updates for improvements and issue resolutions. Additionally, Microsoft acknowledged other issues related to updates from August, including disruptions in printing and PDF exporting due to .NET Framework updates, gaming problems from peripherals with RGB lighting, and alerts regarding Microsoft Defender Antivirus being disabled. They also fixed issues related to the loss of custom mouse settings and desktop configurations following the installation of the KB5120998 August 2026 preview update.

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September 11, 2026

September Windows Server updates break Remote Desktop Services

Windows administrators are experiencing significant challenges with Remote Desktop Services (RDS) following the installation of the September 2026 cumulative updates for Windows Server versions 2019, 2022, and 2025. Users are unable to connect, and some require a hard reset to regain functionality. Reports indicate that RDS servers initially function well but fail after a few hours, with existing sessions struggling to disconnect and new connections failing. Administrators have noted that issues arise after user logouts, leading to service crashes and deadlocks between Remote Desktop and the Local Session Manager. Microsoft has not confirmed the cause of these failures, which affect all mentioned Windows Server releases. Some administrators have restored functionality by rolling back the updates, but this also removes important security fixes. Microsoft is investigating the issue and will provide guidance.

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September 9, 2026

Critical Windows BitLocker Flaw Sparks Urgent Patch

On September 8, 2026, Microsoft disclosed a security vulnerability identified as CVE-2026-69449, related to a heap-based buffer overflow in the Windows BitLocker component, allowing authorized attackers to execute code on compromised machines. The vulnerability is classified as CWE-122, and is assessed as “Exploitation Less Likely.” It affects Windows 10, Windows 11, and Windows Server versions from 2012 to 2025. The fixes are included in cumulative updates KB5124008, KB5124012, KB5122878, and KB5122871. No public disclosure or observed exploitation occurred before the patch's release. The flaw allows for remote code execution through in-network attacks, primarily posing a risk to insiders. Affected systems include various versions of Windows 10, Windows 11, and Windows Server, applicable to both x64 and ARM64 architectures. Administrators should verify installed build numbers to ensure updates have been applied. The advisory does not specify which BitLocker code path is affected or the nature of the input that reaches the vulnerable buffer.

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September 8, 2026

Microsoft releases Windows security update addressing 723 flaws

Microsoft released its September 2026 security updates, addressing two critical Windows elevation-of-privilege vulnerabilities: CVE-2026-85880 and CVE-2026-81963. Both vulnerabilities were exploited before their public disclosure on September 8. CVE-2026-85880 involves a heap-based buffer overflow in the Windows Advanced Local Procedure Call (ALPC), allowing low-privileged attackers to gain SYSTEM privileges. CVE-2026-81963 affects the Windows Update Stack due to improper link resolution and access controls, enabling similar privilege escalation. The September release also includes 974 Common Vulnerabilities and Exposures (CVEs) across various Microsoft products, with 723 affecting Windows. Users of Windows 11 24H2 and 25H2 receive updates via KB5124008, while Windows 11 26H1 receives KB5124012. Windows 11 24H2 Home or Pro editions will reach end of servicing on October 13, 2026. Users are advised to install the updates promptly and back up important data.

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August 25, 2026

Microsoft: August updates break printing, PDF export in WPF apps

Microsoft has acknowledged a significant issue with the .NET Framework updates from August 2026, causing disruptions in printing and PDF export functionalities in certain applications, particularly those using the Windows Presentation Foundation (WPF) UI framework. After installing the update, some WPF applications may encounter a System.IO.FileFormatException when printing or generating PDF/XPS content with specific fonts, including Calibri. This issue affects various platforms, including Windows 10, Windows 11, and Windows Server editions from 2012 to 2025. Microsoft has provided a temporary workaround involving the Switch.MS.Internal.TtfDelta.DisableCmapAndSbitOverflowProtection AppContext switch, but cautions that it may expose systems to vulnerabilities. This situation is reminiscent of a similar incident in February 2021, where WPF applications and Visual Studio experienced crashes after Windows 10 cumulative updates. Additionally, on the same day, Microsoft offered a workaround for another issue caused by Windows 11 updates that led to crashes in certain games.

Winsage

August 24, 2026

Microsoft shares workaround after Windows KB5120708, KB5120705, KB5120710 break printing

Microsoft released its monthly Patch Tuesday security updates, which included dynamic updates and new .NET Framework versions. Users of Windows 11, Windows 10, and Windows Server are experiencing printing issues after installing the August 2026 .NET Framework cumulative updates, particularly with Windows Presentation Foundation (WPF) applications that fail during printing tasks or when generating PDF or XPS documents. The problems are linked to specific fonts, notably Calibri, and may result in a System.IO.FileFormatException. Microsoft has provided a temporary workaround involving an AppContext switch, but enabling this switch disables certain security protections from the August 2026 update, potentially exposing applications to vulnerabilities. No permanent fix or timeline for one has been provided.