Microsoft has released the Windows 11 cumulative update KB5065426 on September 9, 2025. This Patch Tuesday rollout upgrades systems to OS Build 26100.6584 and delivers important security fixes, AI improvements, and new user features.
If you’re running Windows 11, version 24H2, here’s everything you need to know about this update.
Key Highlights of KB5065426
🔒 Security Fixes
- Patches 80+ vulnerabilities including two zero-day flaws like CVE-2025-55234 (SMB Server).
- Covers elevation of privilege, remote code execution, denial of service, spoofing, and more.
✨ New Features
- Recall App Redesign (Copilot+ PCs): Modern homepage with snapshots, recent apps, websites, and streamlined navigation.
- Click to Do Interactive Tutorial: Step-by-step guide for new productivity features.
- Taskbar Clock with Seconds: A long-awaited addition, available in Settings > Time & language.
- Enhanced Windows Search: Images now appear in a neat grid layout.
- Lock Screen Widget Customization: More personalization options for quick info at a glance.
🛠 Fixes & Stability
- MSI Installations: Prevents unexpected UAC prompts for apps like Office 2010 and Autodesk.
- SMB Server Auditing: Helps IT admins prepare for stricter security policies.
- Input Method Stability: Fixes crashes and unresponsiveness in some apps.
- IIS Manager Modules: Restores missing IIS modules after updates.
- NDI Audio in OBS Studio: Resolves stuttering issues with NDI capture.
🤖 AI & System Enhancements
- AI components (image search, semantic analysis, content extraction) updated to v1.2508.906.0.
- Servicing Stack Update KB5064531 (Build 26100.5074) included for smoother future updates.
Known Issue
Some devices using hotpatching may experience PowerShell Direct connection failures between host and guest VMs. Microsoft has provided a workaround in KB5066360, and recommends keeping both host and guest fully updated.
How to Get the Update
KB5065426 installs automatically via Windows Update. To check manually:
- Open Settings
- Navigate to Windows Update
- Click Check for updates
Why This Update Matters
KB5065426 isn’t just another routine patch—it brings major security hardening, a refreshed Recall app, and quality-of-life improvements like the taskbar seconds clock. For businesses, the fixes to MSI installs and SMB auditing are particularly impactful.
Staying updated means staying secure—and with this release, also more productive.
