cumulative update Archives

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October 12, 2026

Microsoft Warns Windows Update Will Stop Working on Unpatched PCs Next Year

Microsoft is updating the certificates that authenticate communication between Windows PCs and Windows Update servers, with the current certificates expiring on May 17 and June 19, 2027. Users will generally not need to take action as the new certificates will be included in regular monthly security updates. Specific requirements for different Windows versions include: - Windows 11 25H2 and later: No action required. - Windows 11 24H2: Must install the September 2025 security update or newer. - Other supported Windows 11 and Windows 10 versions: Need the July 2026 update or later before June 19, 2027. - Windows 10 Enterprise 2019 LTSC, Windows Server 2019, and Windows Server 2016: Deadline of May 17, 2027. Devices running unsupported versions will lose access to Windows Update services. Home users with Windows 10 PCs not enrolled in Extended Security Updates (ESU) after October 2025 may miss the critical July 2026 patch. Microsoft has extended ESU coverage until October 12, 2027. Users should check their update history to ensure they have received a cumulative update from July 2026 or later.

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October 1, 2026

Microsoft Releases the Windows 11 2026 Update, Version 26H2, as a Small Enablement Package

Microsoft has rolled out the Windows 11 2026 Update (version 26H2) for eligible devices running Windows 11 versions 24H2 or 25H2. The update is being implemented as a controlled feature rollout and is delivered as an enablement package, activating features already integrated into the system. Versions 24H2, 25H2, and 26H2 share a unified servicing branch and codebase, making the installation process similar to a standard monthly cumulative update. Windows 11 26H2 consolidates various improvements, security enhancements, and fixes from version 25H2, with some features previously disabled in 25H2 now enabled by default. Installing 26H2 resets the support clock, providing 24 months of support for Home and Pro editions and 36 months for Enterprise and Education editions. Users can manually request the update through Windows Update settings. Organizations can deploy version 26H2 using Windows Autopatch and other management tools, with a recommendation for targeted deployment initially. Devices that shipped with Windows 11 version 26H1 cannot upgrade to 26H2 due to differences in the Windows core. Microsoft may also implement safeguard holds on devices with known compatibility issues, delaying the update until resolved.

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September 30, 2026

Microsoft Releases the Windows 11 2026 Update, Version 26H2, as a Small Enablement Package

Microsoft has unveiled the Windows 11 2026 Update, version 26H2, on September 29, 2023, accessible for eligible devices running Windows 11 versions 24H2 or 25H2. The update is a controlled feature rollout and is delivered as an enablement package, activating features already embedded in the system. It consolidates improvements, security patches, and enhancements from the past year, with some features previously disabled in 25H2 now enabled by default in 26H2. Installing 26H2 resets the support lifecycle, providing 24 months of support for Home and Pro editions and 36 months for Enterprise and Education editions. Users can manually request the update through Windows Update settings. Organizations can deploy 26H2 via Windows Autopatch and other management tools, with targeted deployments recommended first. Devices that shipped with Windows 11 version 26H1 cannot upgrade to 26H2 and will receive a future upgrade path instead. Microsoft may also implement safeguard holds on devices with known compatibility issues.

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September 25, 2026

Windows 11 24H2 Home and Pro editions reach end of updates on October 13, 2026 — here’s what you must do

Microsoft announced that the Home and Pro editions of Windows 11 version 24H2 will stop receiving updates after October 13, 2026. The Enterprise and Education editions of Windows 11 24H2 will continue to be supported until October 12, 2027. Windows 11 SE will also reach its end of support in October 2026, with no feature updates after 24H2. Users are encouraged to upgrade to Windows 11 version 25H2 to extend their support window until October 2027. The upgrade requires Windows 11 version 24H2 and a specific cumulative update. If users do not upgrade, Microsoft will automatically push the 25H2 update to unmanaged Home and Pro devices.

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September 24, 2026

Microsoft Ships September Preview Updates for Windows 11

Microsoft has released preview updates for Windows 11 versions 24H2, 25H2, and 26H1 as part of its Week D schedule. Users of versions 24H2 and 25H2 can install the preview cumulative update KB5124010, updating their systems to builds 26100.9550 and 26200.9550, respectively. Enhancements include refinements to File Explorer, support for Emoji 17.0, a new Tips widget, improved desktop backgrounds, enhanced Bluetooth functionality, upgrades to the Settings app, additional touchpad gesture controls, new key remapping options in Copilot, and Wi-Fi support in the Windows Recovery Environment. The final monthly update for Windows 11 version 24H2 will be shipped next month, with the version set to reach the end of its support lifecycle on October 13, 2026. Users of version 26H1 can install the preview cumulative update KB5124006 to upgrade to build 28000.3086. This update includes a resizable Taskbar, customizable Start menu, revamped Windows Search, improvements to File Explorer, enhanced progress indicators, and better app update support.

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September 17, 2026

What Windows 11 KB5129195 fixes

On September 14, 2026, Microsoft released KB5129195, an out-of-band cumulative update for Windows 11 versions 24H2 and 25H2, transitioning systems to build 26100.9457 for 24H2 and 26200.9457 for 25H2. The update addresses several regressions, including failed connections and sign-ins in Remote Desktop Services, host-folder sharing failures in Plan9 file sharing for HCS-managed Linux virtual machines, and failures affecting 8-channel and 3D-audio modes in USB Audio Class 1.0. However, it does not fix ongoing issues with AMD Radeon graphics cards, such as freezes, black screens, and driver timeouts, which have affected various hardware configurations. KB5129195 is available through multiple distribution channels, including Windows Update and WSUS.

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September 10, 2026

Microsoft says September updates fix mouse settings reset issues

Microsoft acknowledged an issue with the KB5120998 August 2026 preview update for Windows 11, where mouse settings related to cursor personalization were altered or reset. This problem affected non-English Windows installations, causing personalized settings to fail to load and revert to standard configurations. The issue was resolved in the subsequent KB5124008 September 2026 cumulative update, which users were encouraged to install. KB5120998 was an optional update, potentially limiting the number of affected users. Additionally, Microsoft has been addressing various mouse-related issues in recent months, including problems with the Windows Recovery Environment and disappearing mouse pointers in Outlook.

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September 10, 2026

Microsoft fixes bug that wiped Windows desktop settings

Microsoft announced that the September 2026 Patch Tuesday updates resolved an issue affecting desktop settings on certain Windows devices, which caused desktop wallpapers to revert to a solid black background after the installation of the KB5120998 August 2026 preview update. This bug impacted Windows 11 24H2 and 25H2 systems, preventing the correct loading of desktop settings and also affecting mouse settings. Microsoft recommended users update their devices to the latest security update released on September 8, 2026 (KB5124008) to benefit from the fix.

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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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August 25, 2026

August’s Windows 11 update breaks printers and PDFs. Microsoft explains why

Microsoft has acknowledged that users may encounter printing issues after installing the August 2026 .NET Framework cumulative update, particularly with applications that use certain fonts like Calibri. Some WPF applications may fail with a System.IO.FileFormatException when printing or generating PDF/XPS content. Microsoft has provided a temporary workaround while investigating these issues. Additionally, the KB5121003 update has been linked to problems affecting the gaming community, which Microsoft is also addressing.