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BleepingComputer
Microsoft releases Windows 10 KB5099539 extended security update
Microsoft has announced the release of the Windows 10 KB5099539 extended security update, which features significant security fixes addressing a record 570 vulnerabilities. This update not only enhances security but also extends the period of support for users enrolled in the Extended Security Updates (ESU) program until October 12, 2027. With no new features being introduced for Windows 10, this update primarily serves to mitigate security threats, particularly critical flaws and historical issues previously acknowledged by Microsoft.
MonitorConfidence: HighShort term horizon
Published 14 Jul 2026, 18:50 UTC3 min read
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Summary
TL;DR
- KB5099539 update includes security patches for 570 vulnerabilities.
- Free Extended Security Updates program extended until October 2027.
- Addresses known issues with File Explorer, Recycle Bin, and OLE Automation.
- Enhances security for RDP with SHA-2 certificate thumbprints.
- Dynamic status reporting for Secure Boot states added.
Interesting facts
- The update addresses critical flaws that included exploited zero-day vulnerabilities.
- Microsoft has no plans for new features in Windows 10 moving forward.