It’s not just Windows 11 that’s getting a bunch of security updates and new features today. Microsoft has also released a major update for Windows 10 22H2, Windows 10 Enterprise LTSC 2021, and Windows 10 IoT Enterprise LTSC 2021 in update KB5099539. Your Windows 10 system will install this important security update automatically starting today, so you don’t need to check for it manually.
KB5099539 is a security update that patches all recently discovered vulnerabilities in Windows 10, ensuring that your PC remains secure. After installing KB5099539, Windows 10 will have build number 19045.7548, reports BleepingComputer.
Since it’s purely a security update, KB5099539 doesn’t introduce any new features… but it does fix some bugs. For example, it should resolve a bug in File Explorer that caused OneDrive shortcuts to stop working as soon as you ran File Explorer in administrator mode. Similarly, an incorrect error message when deleting files should no longer appear. Issues with certain keyboard shortcuts should also be resolved.
Important: Just like Windows 11 machines, Windows 10 PCs are also receiving new Secure Boot certificates. Regarding the current status of the Secure Boot rollout, Microsoft says the following:
Secure Boot certificates used by most Windows devices were set to expire starting in June 2026. Microsoft has been updating these certificates on PCs and non-managed business devices for the past months. Devices that haven’t received the newer certificates will continue to start, and standard Windows updates will continue to install. We will continue to install the newer certificates via Windows updates in the coming months.
Your PC will only receive the KB5099539 update if your Windows 10 has been enrolled in the Extended Security Updates (ESU) program. You’ll continue to receive ESU updates until October 12th, 2027.
Further reading: Got Windows 10 ESU? You might’ve missed this email
