GoKawiilMicrosoft has released the Windows 10 KB5099539 extended security update, which includes the July 2026 Patch Tuesday security updates for 570 vulnerabilities, along with additional security fixes.
Initially, Microsoft only offered consumers one year of extended security updates. However, last month, Microsoft quietly extended its free Windows 10 Extended Security Updates (ESU) program for consumers by an additional year, allowing enrolled devices to receives security updates until October 12, 2027.
If you are running Windows 10 Enterprise LTSC or are enrolled in the ESU program, you can install this update like normal by going into Settings, clicking on Windows Update, and manually performing a 'Check for Updates.'
Windows 10 KB5099539 update
Source: BleepingComputer
After installing this update, Windows 10 will be updated to build 19045.7548, and Windows 10 Enterprise LTSC 2021 will be updated to build 19044.7548.
What's new in Windows 10 KB5099539
Microsoft is no longer releasing new features for Windows 10, and the KB5099539 update primarily contains security updates and bug fixes.
The update also includes fixes released as part of today's record-breaking July 2026 Patch Tuesday, which fixed a record-breaking 570 vulnerabilities, including two exploited and one publicly disclosed zero-day flaws.
The complete list of fixes in KB5099539 is listed below:
... continue reading