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Microsoft Releases Windows 10 Update With July 2026 Security Fixes

· Original article ↗

Summary

Windows 10 update KB5099539 delivers July 2026 fixes for 570 vulnerabilities, including two exploited and one publicly disclosed zero-day, and adds security hardening. Consumer ESU updates are available through October 12, 2027.

Key points

  • KB5099539 includes July 2026 Patch Tuesday fixes for 570 vulnerabilities, including two exploited zero-days and one publicly disclosed zero-day.
  • Microsoft says enrolled consumer devices can receive free Windows 10 Extended Security Updates through October 12, 2027.
  • The update enforces TDI transport registration requirements, which may affect applications using unregistered third-party transports.
  • Administrators can check the Windows System event log for AFD Event ID 16003 to identify affected TDI transports.
  • The update adds Secure Boot status reporting and expands device targeting for automatic Secure Boot certificate updates.
  • RDP security guidance adds SHA-2 certificate thumbprints for trusted publishers and Group Policy controls intended to reduce phishing risks.

Article Details

Event Type
Release of the Windows 10 KB5099539 extended security update
Impact
The update delivers July 2026 security fixes for 570 vulnerabilities, including two exploited zero-days and one publicly disclosed zero-day, and adds security hardening and bug fixes. It updates Windows 10 to build 19045.7548 and Windows 10 Enterprise LTSC 2021 to build 19044.7548. Microsoft says the TDI transport hardening may affect applications using unregistered third-party TDI transports; no other known issues are reported.

Vendors

MicrosoftMicrosoft has released Windows 10 KB5099539, an extended security update that delivers the July 2026 Patch Tuesday fixes for 570 vulnerabilities, including two exploited zero-days and one publicly disclosed zero-day.

Products

Windows 10Microsoft has released Windows 10 KB5099539, an extended security update that delivers the July 2026 Patch Tuesday fixes for 570 vulnerabilities, including two exploited zero-days and one publicly disclosed zero-day.Windows 10 Enterprise LTSCIf 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.’

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