Let’s discuss the 2025 September KB5065426 KB5065431 Windows 11 Patch | 2 Zero Day Vulnerabilities and 81 Flaws. Windows Patching is the process of installing updates on the Windows operating system and other Microsoft software. These updates address security vulnerabilities, fix bugs, and enhance system performance.
In the September patch release, Windows 11 receives two updates, KB5065426 and KB5065431, which include various improvements and important security fixes. At the same time, Windows 10 gets an update, KB5065429, to enhance system performance and security.
In the September patch update, Windows introduces a new feature for app permissions. When an app tries to access your location, camera, microphone, or other device features, a redesigned pop-up will appear asking for your permission. To make it more noticeable, the rest of the screen will dim slightly, and the prompt will be displayed in the center of the screen.
This patch update fixes issues related to Input in Windows 11. It resolves a problem where typing Chinese with an IME after copying using CTRL + C could cause the first character to not display. It also addresses a bug in textinputframework.dll that could cause apps like Sticky Notes and Notepad to crash.
Table of Contents
What Kerberos Issue was Fixed in the September Patch?
The September patch fixes an underlying crash in Kerberos that could occur when trying to access a cloud file share, improving stability during network authentication.
2 Zero Day Security Vulnerabilities for September 2025
On September 9, 2025, two publicly disclosed zero-day vulnerabilities were fixed. The first, CVE-2025-55234, is a Windows SMB elevation of privilege vulnerability that was publicly disclosed and assessed as “Exploitation More Likely,” though it hasn’t been exploited in the wild.
The second, CVE-2024-21907, relates to improper handling of exceptional conditions in Newtonsoft.Json, marked as “Exploitation Less Likely,” and it also hasn’t been exploited. Both issues were addressed in this update to enhance security.
- 41 Elevation of Privilege Vulnerabilities
- 2 Security Feature Bypass Vulnerabilities
- 22 Remote Code Execution Vulnerabilities
- 16 Information Disclosure Vulnerabilities
- 3 Denial of Service Vulnerabilities
- 1 Spoofing Vulnerabilities
| Release Date | CVE Number | CVE Title | Publicly Disclosed | Exploitability Assessment | Exploited |
|---|---|---|---|---|---|
| Sep 9, 2025 | CVE-2025-55234 | Windows SMB Elevation of Privilege Vulnerability | Yes | Exploitation More Likely | No |
| Sep 9, 2025 | CVE-2024-21907 | VulnCheck: CVE-2024-21907 Improper Handling of Exceptional Conditions in Newtonsoft.Json | Yes | Exploitation Less Likely | No |
- Windows 11 Version Numbers Build Numbers Major Minor Build Rev
- Updated Windows 11 End-of-Life Dates
- Top 83 Windows 11 Desktop Admin Interview Questions
2025 September KB5065426 KB5065431Windows 11 Patch
In this patch update, the Lock screen gains more widget options and supports personalization, allowing you to add, remove, and rearrange widgets like Weather, Watchlist, Sports, Traffic, and more. Any widget that supports the small size option can be added.
These updates, initially launched for Windows Insiders in the European Economic Area (EEA), are now expanding to all regions. To customize your lock screen widgets, go to Settings > Personalization > Lock screen.
| Windows 11 24H2 | Windows 11 23H2 and 22H2 |
|---|---|
| KB5065426 | KB5065431 |
Updated Version of Windows 11 after Installing KB5065426 KB5065431 September 2025 Patch
Windows 11 is available in multiple versions, including Home, Pro, and Enterprise, each offering different features and management options to suit personal, professional, and business needs. The below list helps you to show more details.
- Windows 11 version 24H2 – Details KB5065426 (OS Build 26100.6584)
- Windows 11 Version 23H2 and 22H2 – Details KB5065431 (OS Builds 22621.5909 and 22631.5909)
- More Details on Windows 11 version Numbers: Windows 11 Version Numbers Build Numbers Major Minor Build Rev
Windows 11 New Improvements and Features
In the September patch release, the Taskbar receives an update to the notification center, bringing back a larger clock that displays seconds above the date and calendar. To enable this feature, go to Settings > Time & language > Date & time and turn on Show time in the Notification Center.
| New Improvements | Details |
|---|---|
| Recall | Shows a custom homepage with your recent activity and most-used apps/websites. After turning on snapshots, you can quickly get back to tasks with Recent Snapshots and see your top 3 apps/websites from the last 24 hours. You can choose which apps/websites are saved in Settings. A new side menu gives quick links to Home, Timeline, Feedback, and Settings. |
| Click to Do | First-time users see a short tutorial that teaches how to finish tasks faster—for example, summarizing text or removing image backgrounds. You can replay the tutorial anytime from More options > Start tutorial. |
| General Update | The pop-up box asking for access to location, camera, or microphone now looks new. The screen dims slightly, and the message shows up clearly in the middle of the screen to highlight privacy. |
| Taskbar – New Feature | The clock in the notification center is now bigger and shows seconds above the date and calendar. You can turn it on by going to Settings > Time & language > Date & time, then enabling Show time in the Notification Center. |
| Search on the Taskbar – Search – New View | A new grid layout helps you quickly find the right image when searching from the taskbar. |
| Search on the Taskbar – Search – Status Info | The search now shows if results are still loading while files are being organized in the background. You can check progress or dismiss the notice when finished. It also shows whether files are stored online (cloud) or on your device. |
| Lock screen – New Feature | Widgets More widgets are available, and you can personalize them by adding, removing, or rearranging items like Weather, Watchlist, Sports, Traffic, and more. Any widget that supports small size can be added. These updates are now available in all regions after testing in the European Economic Area (EEA). You can customize them from Settings > Personalization > Lock screen. |
| File Explorer – New Dividers | Dividers now separate top-level icons in the context menu for better organization. |
| File Explorer – People Info | If signed in with a work or school account (Entra ID), you’ll see people’s icons in the Activity column and Recommended section. Hovering or selecting an icon shows their Microsoft 365 Live Persona Card with details and file connections. |
| Windows Hello – New Interface | A redesigned interface makes it easier and faster to sign in using passkeys or connected devices. It’s now more modern and appears in places like the sign-in screen, passkey, Recall, Microsoft Store, and more. |
| Windows Hello – Improved | Fingerprint login after standby is now more reliable and works better. |
| Settings – Activation Prompts | Windows activation and expiration messages now match the Windows 11 style and appear as system notifications when action is needed. The messaging under Settings > System > Activation has also been improved. |
| Settings – AI Permissions | Under Settings > Privacy & security > Text and Image Generation, you can see which third-party apps have used generative AI and control which apps are allowed to access it. |
| Settings – Copilot+ Support | The agent in Settings helps you quickly find and change settings. It’s now available on AMD- and Intel-powered Copilot+ PCs (initially on Snapdragon PCs) and works when the display language is set to English. |
| Task Manager – CPU Metrics | Task Manager now uses standard metrics for CPU workload across all pages, matching industry standards and third-party tools. If you want the old view, you can turn on the CPU Utility column in the Details tab to see the previous CPU usage from the Processes page. |
| Widgets – Multiple Dashboards | You can now create multiple dashboards in the Widgets Board to organize your favorite widgets and stay updated with current events. A new left-side navigation bar makes it easy to switch between dashboards and views like the Discover feed. These updates are now available in all regions after launching in the EEA. |
| Widgets – Discover Feed | The Discover feed has a new look that’s more organized, personalized, and engaging. It includes Copilot-curated stories with summaries, videos, and images from trusted MSN publishers. You can customize it via Widgets > Discover dashboard > Personalization settings. |
| Windows Backup for Organizations | Provides enterprise-grade backup and restore for smooth device transitions—helpful during device refreshes, Windows 11 upgrades, or AI PC deployments. Ensures productivity with minimal disruption. |
| PowerShell 2.0 | Starting August 2025, Windows 11 (version 24H2) will no longer include PowerShell 2.0. It was deprecated in 2017. Most users won’t be affected since PowerShell 5.1 and 7.x are supported. Update older scripts/tools if they depend on 2.0. |
Issues Fixed with Windows 11 September Patch 2025
In the September patch, the issue with Live Captions has been fixed. Previously, changing the opacity in Settings > Accessibility > Captions > Caption Style had no effect, but this update ensures that opacity adjustments now work as expected.
| Issues Fixed with Windows 11 September Patches | Description |
|---|---|
| Taskbar – Issue Fixed | Dragging your mouse across the taskbar preview thumbnail no longer causes the preview to stop working. |
| File Explorer – Fixed Issue | The unblock option in the file’s Properties no longer stays blocked after reopening; the issue has been fixed. |
| Windows Hello – Fixed | A problem where face recognition would fail even after recognizing you has been fixed. If issues continue, you can improve recognition in Settings > Accounts > Sign-in options > Facial Recognition. |
| Settings – Fixed Issue | A bug that caused Settings to crash when adding a security key under Settings > Account > Sign-in options has been fixed. |
| Live Captions – Fixed | The issue where changing caption opacity in Settings > Accessibility > Captions > Caption Style had no effect has been fixed. |
| Input – IME Issue | Typing Chinese with an IME after copying using CTRL + C could cause the first character to not show. This has been fixed. |
| Input – App Crashes | A problem in textinputframework.dll that caused apps like Sticky Notes and Notepad to crash has been resolved. |
| dbgcore.dll | Fixed an issue where certain apps, including explorer.exe, could crash. |
| Kerberos issue fixed | Fixed a crash that could occur when accessing a cloud file share. |
| Login Issue Fixed | Improved login experience by fixing cases where a blank white screen or “just a moment” message would appear for several minutes. |
| Miracast issue fixed | Fixed an issue where audio would start but stop after a few seconds when casting to a TV on some devices. |
| Audio issue fixed | Improved reliability by fixing cases where the audio service would stop responding, affecting playback. |
| Cryptographic Provider (known issue) fixed | Fixed an error in Windows Event Viewer (Error ID 57) where the Microsoft Pluton Cryptographic Provider failed to load due to initialization issues. |
| Device Management | Fixed an issue where some system recovery features didn’t work due to temporary file sharing conflicts, affecting certain device management tools. |
| File System (ReFS) | Fixed a problem where using backup apps with large files could sometimes exhaust system memory. |
| Input – Chinese (Simplified) IME | Fixed an issue where some extended characters appeared as empty boxes. |
| Input – Touch Keyboard IMEs | Fixed a problem preventing typing on the touch keyboard when using Microsoft Changjie, Microsoft Bopomofo, or Microsoft Japanese IMEs after reverting to a previous version. |
| Performance – ARM64 Devices | Fixed an issue that slowed application installation; some installers took longer than expected to complete. |
Known Issues from September Windows 11 Patch 2025
A known issue in the September 2025 Windows 11 patch is that non-admin users may receive unexpected UAC prompts when performing MSI repair operations. This occurs due to a security improvement that enforces administrator credentials for certain Windows Installer actions, affecting standard users running MSI repairs or related tasks.
| Summary | Originating Update | Status |
|---|---|---|
| Non-admins might receive unexpected UAC prompts when doing MSI repair operations | OS Build 26100.4946 KB5063878 2025-08-12 | Next Steps: A future Windows update will let IT admins allow specific apps to perform MSI repair operations without UAC prompts. |
Direct Download Links of Windows 11 KB5065426 KB5065431
The September 2025 Windows 11 updates are now available on the Microsoft Update Catalog. To locate a specific update, enter its KB number in the search bar and click Search. To view all updates released in September 2025, type “2025-09” in the search box to see the complete list.
| Cumulative Update for Windows 11 | Products | Size | Direct Download |
|---|---|---|---|
| 2025-05 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5065426) | Windows 11 24H2 | 3811.1 MB | Download |
| 2025-05 Cumulative Update for Windows 11 for x64-based Systems (KB5065431) | Windows 11 23H2 | 901.8 MB | Download |
| 2025-05 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5065431) | Windows 11 22H2 | 901.8 MB | Download |
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Resources
September 9, 2025—KB5065426 (OS Build 26100.6584) – Microsoft Support
Author
Anoop C Nair has been Microsoft MVP from 2015 onwards for 10 consecutive years! He is a Workplace Solution Architect with more than 22+ years of experience in Workplace technologies. He is also a Blogger, Speaker, and Local User Group Community leader. His primary focus is on Device Management technologies like SCCM and Intune. He writes about technologies like Intune, SCCM, Windows, Cloud PC, Windows, Entra, Microsoft Security, Career, etc.