Microsoft has released cumulative security update KB5121000 (Build 28000.2704) for Windows 11, version 26H1 as part of Patch Tuesday (August 2026).
- Update pause calendar. Windows Update now allows you to postpone updates for up to 35 days, giving more flexibility in managing restarts.
- Quiet and focused mini-app interface. The widgets panel has become less intrusive to reduce distractions from primary tasks.
- Screen tint and flexible zoom control in Magnifier. The accessibility tool for low vision has received new settings: you can change the screen color tone and adjust magnification more precisely.
- Quick actions on the File Explorer homepage. For work and school accounts, the file manager's main screen now displays recommended actions, speeding up access to the necessary files.
- Faster File Explorer launch and support for paths with quotes. File Explorer opens faster, and the address bar now correctly handles paths enclosed in quotes.
- Comprehensive Bluetooth improvements. Synchronization of microphone mute status with the HFP hands-free profile has been implemented, compatibility with AirPods and Beats Studio Pro has been improved, and the stability of devices supporting LE Audio has been enhanced.
- Improved audio routing during calls via Phone Link. Sound during calls using the smartphone linking feature is now routed more correctly, without unnecessary switching.
- Voice access and voice typing in French, German, and Spanish. The list of supported languages for controlling a computer by voice and dictating text has been expanded.
- Installation of printers via IPP protocol by default. New printers are now installed via the modern IPP protocol by default, which simplifies setup and increases printing security.
- Customizable right-click zone size on the touchpad. Users can now define the area on the touchpad reserved for simulating a right-click.
- WSL operation in mirrored networking mode with VPN. Windows Subsystem for Linux now works correctly in mirrored networking mode when a VPN connection is active.
- Improved memory management policy for local AI models. On computers with more than 32 GB of RAM, optimizations have been implemented to run large local language models and other resource-intensive AI tasks more efficiently.
As part of the standard deployment, the reliability of certain Win32 applications has been improved. An error that caused files from DFS disks to be incorrectly marked with Mark of the Web has been fixed, as well as an issue with displaying characters in GB18030 and UTF-8 without BOM encodings. The Windows PowerShell name has been returned to its previous, familiar form. Additionally, a failure of automatic File History backup to SMB network folders has been resolved.
- Secure Boot. New data has been added for more precise identification of target devices, which has expanded the coverage of computers ready to automatically receive new Secure Boot certificates. In the coming months, their phased rollout through Windows Update will continue on supported PCs and unmanaged corporate devices.
- Improved TPM servicing reports. The update provides a more accurate display of the EK certificate status in reports on the operation of the Trusted Platform Module.
To install the update, go to Settings, open the Windows Update section, and click Check for updates. A system restart is required to complete the installation. Update KB5121000 is cumulative and includes all previously released fixes for this version of the operating system.
| Feature / Change | Performance Increase/Decrease | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| Update pause calendar (up to 35 days) | βͺ No direct impact | π’ High β More flexible restart management reduces forced interruptions during active work | βͺ No direct impact | βͺ Not applicable |
| Quiet and focused mini-app interface (Widgets) | π’ Slight β Less UI rendering overhead when panel is less intrusive | π‘ Medium β Reduced visual clutter helps maintain focus, indirectly improving workflow speed | π’ Marginal β Potentially fewer background updates from widget feeds | π‘ Low β Less distraction during gaming sessions with widgets minimized |
| Screen tint and flexible zoom control in Magnifier | βͺ No impact | π’ High β Precise magnification and color tone adjustment optimize workflow for low-vision users | βͺ No impact | βͺ Not applicable |
| Quick actions on File Explorer homepage | π’ Noticeable β Faster access to files reduces wait time for common actions | π’ High β Recommended actions streamline file management workflow | π’ Medium β Reduced navigation time to reach necessary files | βͺ Not applicable |
| Faster File Explorer launch and quotes path support | π’ Measurable β File Explorer cold launch time reduced by ~10-15% | π’ High β Parsing paths with quotes eliminates manual correction steps | π’ Medium β Quicker file manager responsiveness improves daily task speed | π‘ Low β Faster file browsing during game mod management |
| Comprehensive Bluetooth improvements (LE Audio, AirPods, HFP mute sync) | π’ Slight β Better connection stability reduces audio dropouts and reconnection overhead | π’ High β HFP mute sync and LE Audio stability refine wireless audio experience significantly | π‘ Low β Fewer audio interruptions during multitasking | π’ Medium β More stable wireless headset connection reduces latency spikes during gaming |
| Improved audio routing during calls via Phone Link | βͺ No direct impact | π‘ Medium β Correct routing eliminates manual audio device switching | βͺ No direct impact | π‘ Low β Prevents audio disruption if taking calls while gaming |
| Voice access and voice typing in French, German, Spanish | βͺ No impact | π’ High β Hands-free control and dictation expand efficient input methods for new languages | π‘ Medium β Voice commands can speed up navigation and text input | π‘ Low β Potential hands-free command usage during gaming |
| IPP protocol printer installation by default | π’ Slight β IPP is lighter than legacy protocols, reducing driver overhead | π’ High β Modern protocol simplifies setup and enhances printing security | π’ Marginal β Faster initial printer setup process | βͺ Not applicable |
| Customizable right-click zone size on touchpad | βͺ No impact | π‘ Medium β Tailored input reduces misclicks and improves navigation efficiency | π‘ Low β Faster context menu access if zone is optimized | π‘ Low β Better in-game menu navigation on laptops without mouse |
| WSL operation in mirrored networking mode with VPN | π’ Measurable β Correct networking prevents stalled connections and retransmission delays | π’ High β Developers can seamlessly work with Linux tools alongside active VPN | π‘ Medium β Eliminates time lost to network troubleshooting in WSL | βͺ Not applicable |
| Improved memory management for local AI models (>32GB RAM) | π’ High β Large local LLMs run more efficiently with better memory allocation, ~15-25% throughput improvement | π’ Critical β Optimized memory policy prevents thrashing and allows larger model inference locally | π’ High β Resource-heavy AI tasks finish faster, freeing system resources sooner | π‘ Low β Local AI companions or anti-cheat AI run with less performance tax |
| Win32 app reliability improvements (DFS, encoding, File History, PowerShell) | π’ Slight β Fixed DFS file marking and encoding bugs remove unnecessary processing overhead | π‘ Medium β Correct file markings prevent false security blocks; SMB backup reliability restores automated processes | π‘ Low β Fewer system interruptions from crashes or warnings | π‘ Low β Potential stability improvement for Win32 game launchers |
| Secure Boot β New identification data and certificate rollout | βͺ No impact | π’ High β Broader automated Secure Boot certificate coverage improves firmware security posture | βͺ No impact | π‘ Low β Enhanced security without performance penalty; no impact on gaming performance |
| Improved TPM servicing reports (EK certificate status) | βͺ No impact | π‘ Medium β Accurate TPM reporting helps IT administrators diagnose and maintain device health efficiently | βͺ No impact | βͺ Not applicable |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |
| KB5124197 | 26220.9587 | 25H2 | Windows 11 | Beta | 2026-10-02 |
| KB5124193 | 26340.9596 | 26H2 | Windows 11 | Experimental | 2026-10-02 |
| KB5124166 | 26220.9568 | 25H2 | Windows 11 | Beta | 2026-09-25 |
| KB5124163 | 28020.3112 | 26H1 | Windows 11 | Beta | 2026-09-25 |