Overview of KB5065426
- Release Date: September 9, 2025
- Build Number: 26100.6584
- Size: ~3.8 GB (x64)
- Distribution Channels: Windows Update, WSUS, Microsoft Update Catalog
- Update Type: Security + Feature Rollup (SSU + LCU combined)
This update is mandatory and installs automatically unless paused. It includes both Servicing Stack Update (SSU KB5064531) and Latest Cumulative Update (LCU), making rollback more complex for IT admins.
🌟 Key Features and Enhancements
1. Recall App – Redesigned Homepage
Exclusive to Copilot+ PCs, the Recall app now features:
- A homepage with recent snapshots
- Navigation bar and search box
- Activity summaries and app usage insights2
2. Click to Do – Interactive Tutorial
Users can now access a built-in tutorial to learn how to use the Click to Do productivity tool.
3. Taskbar Clock with Seconds
The Notification Center now displays a full clock with seconds, similar to Windows 10, enhancing time visibility.
4. File Explorer – AI Actions
AI-powered context menu actions include:
- Visual Search
- Blur Background
- Erase Objects
- Remove Background
- Document Summarization These features support formats like JPG, PNG, DOCX, PDF, and more.3
5. Windows Search – Grid View for Images
Image search results now appear in a grid layout, improving visual navigation.
6. Lock Screen Widgets Customization
Users can now choose which widgets appear on the lock screen, previously limited to European regions.
7. Windows Hello – Modernized UI
- Animated icons for sign-in methods
- Improved facial recognition and fingerprint login
- Enhanced passkey credential dialogs3
🛡️ Security and Reliability Fixes
✔️ Installer Hardening
Fixes for CVE-2025-50173 address MSI repair vulnerabilities and reduce unnecessary UAC prompts.
✔️ Streaming Fixes
Resolved issues with NDI/OBS streaming, including audio/video stutter caused by August updates.
✔️ SMB Auditing Enhancements
Improved auditing for SMB Server signing and Extended Protection for Authentication (EPA).
✔️ Input and IIS Manager Fixes
- Fixed app input responsiveness issues
- Restored missing IIS Manager modules1
⚠️ Known Issues
- PowerShell Direct (PSDirect) may fail on hotpatched hosts/guests due to handshake bugs.
- Microsoft recommends updating both host and guest VMs.
- A follow-up patch (KB5066360) is available to resolve this.
KB5065426 is a feature-rich and security-focused update that continues Microsoft’s push toward AI integration and user experience enhancements in Windows 11. While the update is large in size due to bundled AI models, it brings meaningful improvements for both everyday users and IT professionals.
