Windows 11 KB5066835 KB5066793 October 2025 Patch and 5 Zero Day Vulnerabilities and 118 Flaws. In the october 2025 Patch Tuesday release, Microsoft rolled out important updates targeting security, stability, and overall system performance.
For Windows 11, the updates KB5066835 and KB5066793 deliver a set of performance enhancements and critical security fixes, addressing vulnerabilities that could impact system integrity. This release also shows 5 zero-day vulnerability along with other security flaws. Windows 10 receives KB5066791, which focuses on improving system reliability, performance, and security
In the October patch, Click to Do introduces several exciting new features designed to enhance productivity and user interactions. The context menu now includes new and popular action tags, making it easier to discover the latest and most widely used AI-powered actions.
The October update addresses an issue in Settings > System > Storage > Disks and Volumes, where a link for BitLocker drive encryption could appear even on unsupported drives. Previously, selecting this link would open BitLocker and trigger error 0x80004005. With the fix, this incorrect link no longer appears, preventing the error and ensuring a smoother, more reliable experience when managing disk encryption.
Table of Contents
5 Zero Day Security Vulnerabilities for October 2025
The October 2025 Patch Tuesday update includes 5 zero-day vulnerabilities, four of which are already being actively exploited. These flaws impact components such as Windows Remote Access Connection Manager, Agere Modem Drivers, IGEL OS Secure Boot, and the TCG TPM 2.0 reference implementation.
| Release Date | CVE Number | CVE Title | Publicly disclosed | Exploitability assessment | Exploited |
|---|---|---|---|---|---|
| Oct 14, 2025 | CVE-2025-59230 | Windows Remote Access Connection Manager Elevation of Privilege Vulnerability | No | Exploitation Detected | Yes |
| Oct 14, 2025 | CVE-2025-47827 | MITRE CVE-2025-47827: Secure Boot bypass in IGEL OS before 11 | No | Exploitation Detected | Yes |
| Oct 14, 2025 | CVE-2025-24990 | Windows Agere Modem Driver Elevation of Privilege Vulnerability | No | Exploitation Detected | Yes |
| Oct 14, 2025 | CVE-2025-2884 | Cert CC: CVE-2025-2884 Out-of-Bounds read vulnerability in TCG TPM2.0 reference implementation | Yes | Exploitation Less Likely | No |
| Oct 14, 2025 | CVE-2025-24052 | Windows Agere Modem Driver Elevation of Privilege Vulnerability | Yes | Exploitation More 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
Windows 11 KB5066835 KB5066793 October 2025 Patch and 5 Zero Day Vulnerability and 118 Flaws
The October update introduces a set of enhancement for Agents in Settings. Now, when you search for an agent, a direct navigation link to its corresponding settings page appears right in the search results. This makes accessing and managing agent settings faster and more intuitive. Currently, this feature is gradually rolling out to Copilot+ PCs, improving the overall user experience.
| Windows 11 25H2 and 24H2 | Windows 11 23H2 and 22H2 |
|---|---|
| KB5066835 | KB5066793 |
Updated Version of Windows 11 after Installing KB5066835 KB5066793 October 2025 Patch
The October update introduces a plugin passkey manager integration in Windows 11. Users can now manage passkeys through a supported plugin credential manager by enabling it in Settings > Accounts > Passkeys > Advanced options and completing verification via Windows Hello (face, fingerprint, or PIN).
- Once set up, you can access existing passkeys or securely save new ones, streamlining passwordless authentication.
- Windows 11 version 25H2 and 24H2 – October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899)
- Windows 11 Version 23H2 and 22H2 – October 14, 2025—KB5066793 (OS Builds 22621.6060 and 22631.6060)
- More Details on Windows 11 version Numbers: Windows 11 Version Numbers Build Numbers Major Minor Build Rev.
- Ensuring Data Protection through Windows Recall with New Security Architecture TPM Windows Hello
- Microsoft Introducing Copilot+ PCs
- Windows PC Recall Feature Photographic Memory
- Windows 11 24H2 Now Available Through WSUS | New Features and Enhancements
Windows 11 Features and New Improvements
The October update brings more time, language, and keyboard settings into Settings, making them easier to access. You can now manage additional clocks, time servers, and date/time formats in Settings > Time & language > Date & time.
Language and region options, including number and currency formats and UTF-8 support, are under Settings > Time & language > Language & region, while keyboard character repeat and cursor blink rate settings are now streamlined in Settings > Accessibility.
| New Improvements | Details |
|---|---|
| New and popular action tags – Click to Do | AI-powered action tags in the Click to Do context menu help users discover the latest and most widely used actions. |
| Summarize action improvements – Click to Do | Click to Do now provides more concise summaries. Output for text entities is shorter, more focused, and clearer due to ongoing enhancements |
| Direct navigation link in Agent Search (Settings) | A direct link to the corresponding settings page is now available from agent search results. Currently rolling out to agents in Settings on Copilot+ PCs. |
| Movable Hardware Indicators (Desktop) | You can now reposition brightness, volume, airplane mode, and virtual desktop indicators on the screen. Navigate to Settings > System > Notifications and choose Position of the onscreen pop-up from the dropdown. |
| Taskbar Pinning Policy Enhancement | IT admins no longer need to restart explorer.exe for pinning policies to take effect. Pins will appear automatically within 8 hours based on refresh interval. |
| New – AI Actions in File Explorer | Right-click (or Shift+F10) on files to access AI-powered actions. Not yet available in EEA regions. |
| Image AI Actions (JPG, JPEG, PNG) – File Explorer | Visual Search – Search the web using an image instead of text. Blur Background – Opens in Photos to highlight subject and blur the rest. Erase Objects – Remove unwanted items from images. Remove Background – Open in Paint to isolate the subject cleanly. |
| AI Actions in Microsoft 365 (Files in OneDrive/SharePoint) – File Explorer | Summarise with Copilot allows quick summaries without opening files. Requires a Microsoft 365 subscription + Copilot license. Supports both Microsoft Account and Entra ID. |
| Improved – Context Menu UI | Accent-colored backplates removed from packaged app icons in Open With list (e.g., Snipping Tool) for better visibility. |
| Improved – Cloud File Performance in File Explorer | Faster launching of cloud files and faster loading of context menus in File Explorer. |
| Pinned Apps in Windows Share Window | You can now easily pin your favorite apps in the Windows Share dialog for faster access whenever sharing content |
| Redesigned Advanced Settings Page | The Advanced page (formerly For Developers) under Settings > System > Advanced has been redesigned for easier navigation. Includes File Explorer + version control, which displays Git details like branch, diff count, and last commit message directly in File Explorer when viewing a repository folder. |
| New – Dash Insertion Shortcuts | Quickly insert punctuation while typing: En dash (–): Windows logo key + Minus (-) Em dash (—): Windows logo key + Shift + Minus (-) Note: If Magnifier is running, Windows logo key + Minus (-) will zoom out instead of inserting an en dash. |
| Fixed – Touch Input Issue After Sleep | Resolved an issue where touch input wouldn’t work on the sign-in screen when waking the PC from sleep, preventing PIN entry. |
| Braille Viewer Integration – New Narrator Feature | Narrator now includes a floating Braille Viewer that displays both on-screen text and its Braille equivalent. How to open: Press Windows logo key + Ctrl + Enter, then Narrator key + Alt + B Before using, enable Braille support via Settings > Accessibility > Narrator > Use a Braille display with Narrator. |
| Improved Word Reading Experience | Narrator now delivers more natural and reliable voice feedback in Microsoft Word, offering smoother navigation for footnotes, comments, lists, and tables. Updates include clearer list announcements, more defined table boundaries, and intuitive text selection feedback. |
| Plugin-Based Passkey Manager Integration – Passkey New Feature | Windows 11 now supports easy integration with third-party plugin credential managers for passkeys. Setup Instructions: Install a compatible credential manager application. Go to Settings > Accounts > Passkeys > Advanced options. Enable support and verify using Windows Hello (face, fingerprint, or PIN). After setup, you can use existing passkeys stored in the plugin or save new passkeys directly through it. |
| Removed – Bing Search History Link in Settings | The “Manage or clear your Bing search history” option under Settings > Privacy & security > Search > Search history has been removed. Search history can now be managed using the Privacy dashboard, accessible from Privacy resources. |
| Settings Migration from Control Panel | Several time, language, and keyboard settings have moved fully to Settings: Date & Time: Add clocks, change time server, customize date/time formats & AM/PM symbols. Language & Region: Number/currency formats, Unicode UTF-8 toggle, copy settings to other accounts. Accessibility: Keyboard character repeat and cursor blink rate. |
| Improved – Apps List Performance | Faster loading of Installed apps under Settings > Apps. |
| Enhanced Xbox Wireless Controller Support (Windows 11 Handhelds) | Currently available on supported handheld devices, with broader rollout to more Windows 11 PCs planned. Short press Xbox button → Opens Game Bar Long press Xbox button → Opens Task View Press and hold → Turns off controller (unchanged) |
| Improved Gaming Performance with Overlays | Optimisations have been made to reduce performance impact when using Game Bar or other overlays during gameplay. This especially benefits users with multi-monitor setups using mixed refresh rates. |
| Modernized System Dialogs – Others New Feature | A new interface now aligns various system dialogs with Windows 11’s visual style, including the dialog shown when an app fails to open. |
| Natural Language Voice Commands | Voice access now supports natural language commanding, allowing users to speak more casually with filler words and synonyms, instead of using strict command phrases. Available on Intel and AMD-powered Copilot+ PCs. |
| Notification Center on Secondary Monitors | Notification Center can now be opened on secondary monitors. You can also show a larger clock with seconds above the calendar (KB5064081). |
| Command Line – Edit Tool | Windows now includes Edit, a command-line text editor. Open Terminal and type edit . Edit is open source on GitHub. |
| Performance – CRL Partitioning | Added support for Certificate Revocation List (CRL) partitioning in Windows Certificate Authorities. |
Issues Fixed with Windows 11 October Patch 2025
This update fixes an issue with Voice Access where it could become stuck, showing that it’s listening but failing to respond. With this fix, Voice Access now operates reliably, ensuring commands are recognized and executed as expected.
| Issues Fixed with Windows 11 October Patches | Description |
|---|---|
| Fixed – Overlapping Icons/Text – File Explorer | Resolved issue where icons and text overlapped on desktop with increased text scaling. |
| Fixed – Mirroring Issue in RTL Languages – File Explorer | Icons in details/preview/navigation panes now correctly mirrored in Arabic and Hebrew display languages. |
| Fixed – Incorrect BitLocker Link – Settings | In Settings > System > Storage > Disks and Volumes, BitLocker links no longer appear in unsupported cases to avoid error 0x80004005. |
| Fixed – Voice Access Unresponsiveness | Resolved an issue where Voice access would appear to be listening but stop responding. |
| Dynamic Lighting | Fixed an issue where the Dynamic Lighting Background Controller could use too much CPU after unlocking the PC. |
| High Dynamic Range (HDR) | Fixed an issue where HDR could turn off immediately after being enabled. |
| Media Playback (Protected Content) | Fixed playback issues for Blu-ray, DVD, and digital TV apps using Enhanced Video Renderer with HDCP enforcement after KB5064081. |
| Quick Settings PIN | Fixed issue where pressing Enter wouldn’t confirm a PIN when casting from Quick Settings. |
| Windows Hello PIN | Fixed an issue where a message said “Something happened and your PIN isn’t available” when entering safe mode. |
| Windows Sandbox CPU Usage | Fixed an issue where VmmemCMFirstBoot could use a lot of CPU after sign-in, making the PC unresponsive. |
| Hyper-V | Fixed issues preventing VMs with TPM from starting on ARM64 devices and freezes when assigning GPU paravirtualisation devices. |
| Input / Chinese IME | Fixed display issues with some Chinese characters, including empty boxes in text fields and unreadable symbols in File Explorer tooltips. |
| Networking (SMB v1) | Fixed connection issues to shared files and folders when using SMB v1 over NetBIOS after KB5065426. |
| Servicing / WSUS | Fixed issues that disrupted Windows Update for WSUS customers. |
| Windows Hello PIN | Fixed PIN setup errors (0x80090010) on devices joined to Microsoft Entra ID domains after recent updates. |
Known Issues from October Windows 11 Patch 2025
Two issues were recently addressed in Windows updates. First, some BluRay, DVD, and Digital TV applications experienced problems playing or recording DRM-protected content. Second, updates installed via WUSA could fail when run from a shared network folder containing multiple .msu files. Both issues have been mitigated as of September 30, 2025, ensuring smoother media playback and reliable update installations
| Summary | Originating Update | Status |
|---|---|---|
| Problems playing protected content in some BluRay/DVD/Digital TV applications | N/A | working on a permanent fix for applications that still experience this issue and will provide more information when it is available. |
| Updates installed via WUSA might fail if installed from a shared folder | N/A | working on releasing a resolution for this issue in a future Windows update. We will provide an update when more information is available. |
| Updates installed via WUSA might fail if installed from a shared folder | OS Build 26100.4202 KB5058499 2025-05-28 | working on releasing a resolution for this issue in a future Windows update. We will provide an update when more information is available. |
| Parental consent may not show for some browser versions with web filtering on | N/A | To temporarily mitigate the browser shutdown issue in Family Safety, parents can turn on Activity reporting in Windows settings, allowing them to receive approval requests as expected. |
| Devices with apps using sprotect.sys driver might stop responding | N/A | SenseShield is currently investigating this issue. Microsoft is collaborating with SenseShield, and we will provide more information when it is available. |
| Wallpaper customization applications might not work as expected | N/A | The safeguard hold for installing Windows 11 version 24H2 is being gradually lifted, but users may need to update or temporarily uninstall certain wallpaper apps to complete the installation, with full resolution depending on app updates. |
Direct Download Links of Windows 11 KB5066835 KB5066793
Microsoft has published the October 2025 Windows 11 updates in the Update Catalog. You can easily search by KB number for a specific update, or enter “2025-10” to view all updates from that month for easy selection and download.
| Cumulative Update for Windows 11 | Products | Size | Direct Download |
|---|---|---|---|
| 2025-04 Cumulative Update for Windows 11 Version 25H2 for x64-based Systems(KB5066835) | Windows 11 25H2 | 3933.9 MB | Download |
| 2025-04 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) | Windows 11 24H2 | 3933.9 MB | Download |
| 2025-04 Cumulative Update for Windows 11 version 23H2 for x64-based Systems (KB5066793) | Windows 11 23H2 | 907.2 MB | Download |
| 2025-04 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5066793) | Windows 11 22H2 | 907.2 MB | Download |
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Resources
October 14, 2025—KB5066835 (OS Builds 26200.6899 and 26100.6899) – 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.