Microsoft has rolled out a new cumulative update for Windows 11 version 23H2, labeled KB5073455 with OS Build 22631.6491. This update delivers the latest security patches, quality improvements from last month’s optional preview, and fixes to system reliability and core component issues.
🔒 What’s Included in KB5073455
This security-focused cumulative update includes:
Security fixes and quality improvements drawn from previous updates, including changes from December’s KB5071417.
Removal of outdated modem drivers that could conflict with system stability. Hardware dependent on these specific drivers will no longer work after updating.
Remote Desktop Protocol (RDP) fix — addresses an issue where RDP connections may fail unexpectedly, requiring a restart.
App stability fixes — resolves problems where text entry in apps like Outlook, Teams, Edge, Chrome, and Excel could cause the app to close unexpectedly.
Secure Boot updates — introduces a phased deployment of updated Secure Boot certificates to eligible devices, helping maintain secure startup processes.
WinSqlite3.dll update — applies a fix to a core Windows component previously misidentified as vulnerable by security software.
This update also includes the latest Servicing Stack Update (SSU) — KB5071963 (Build 22621.6265) to ensure reliable installation of Windows updates going forward.
💡 Important Security Notice: Secure Boot Certificates
Microsoft warns that Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Devices that do not receive updated certificates in time may face challenges with secure startup. Users and admins should review Microsoft’s guidance and prepare in advance to avoid disruption.
📌 No Known Issues Reported
As of this release, Microsoft is not aware of any issues affecting KB5073455. This means most users should install the update without concern.
🚀 How to Install the Update
The update will automatically download and install via Windows Update and Microsoft Update. Most devices will update in the background, but you can manually check for it by going to:
Settings → Windows Update
Click Check for updates
Windows will then download and install KB5073455 if it’s available for your device.
You can also install it via Windows Update for Business or Catalog Server Update Services on managed networks.
🧠 Why This Update Matters
Keeps your system protected against the latest security threats.
Improves stability and performance in core Windows components.
Helps prepare your device for upcoming changes related to certificate expiry.
Especially for users on Windows 11 version 23H2, installing KB5073455 ensures you’re running the most secure and stable version available.
Download link:
You can download and manually install Windows 11 update KB5073455 by clicking here. If you need help in understanding how to install these updates manually on your PC, you can refer to our step by step noob-friendly tutorial.
