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Microsoft Windows 10 KB5099539 extended security update

Security Patch Release
First reported
Last updated
Happening score
H score 16
1 unique sources, 1 articles

Summary

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Microsoft released Windows 10 KB5099539, a security update bundle for Windows 10 ESU that rolls in July 2026 Patch Tuesday fixes for 570 vulnerabilities. The package also includes additional security fixes, making it a broad maintenance release for supported Windows 10 and Enterprise LTSC systems. Microsoft says enrolled devices can install it through Windows Update like a normal update.

Related Happenings

Microsoft RDP file security guidance

Advisory/Mitigation
H score28 First: 14.07.2026 21:49 Last: 14.07.2026 21:49 Sources 1

How related: "New guidance is available for managing RDP file security through Group Policy to help organizations reduce phishing risks by controlling which .rdp files users can open."

About this happening: Microsoft issued **RDP** mitigation guidance that restricts which **.rdp files** users can open and recommends migrating trusted publishers to **SHA-256 thumbprints**, reducing ph...

Open Happening

Windows 11 KB5101650 and KB5099414 cumulative updates

Security Patch Release
H score27 First: 14.07.2026 20:41 Last: 14.07.2026 20:41 Sources 1

About this happening: **Microsoft** released **Windows 11 KB5101650** and **KB5099414** cumulative updates for **25H2/24H2** and **23H2**, delivering the **July 2026 Patch Tuesday** fixes for **571 vul...

Open Happening

Microsoft extends Windows 10 ESU consumer coverage through October 2027

Security Tool/Service
H score11 First: 25.06.2026 21:29 Last: 25.06.2026 21:29 Sources 1

About this happening: **Microsoft** quietly extended the **Windows 10 Extended Security Updates (ESU)** program for **personal devices** by **one additional year**, keeping critical security update cov...

Open Happening

Microsoft Windows Update installation failures on upgraded Windows 11 PCs

Service Disruption
H score1 First: 10.06.2026 14:33 Last: 10.06.2026 14:33 Sources 1

About this happening: **Microsoft Windows Update** is failing on a **small percentage of upgraded Windows 11 PCs**, blocking **June 2026 cumulative updates** and producing **0x80073712** or **0x800f099...

Open Happening

Windows 10 KB5094127 extended security update

Security Patch Release
H score10 First: 09.06.2026 21:35 Last: 09.06.2026 21:35 Sources 1

About this happening: Microsoft released **Windows 10 KB5094127** for **Windows 10 Enterprise LTSC** and **ESU-enrolled devices**, delivering the **June 2026 Patch Tuesday** security fixes and extendin...

Open Happening

Timeline

  1. 14.07.2026 21:49 2 articles · 1h ago

    Microsoft releases Windows 10 KB5099539 for ESU devices

    Initial Disclosure

    Microsoft releases Windows 10 KB5099539 for Windows 10 ESU and Windows 10 Enterprise LTSC 2021, bundling July 2026 Patch Tuesday security updates for 570 vulnerabilities plus additional security fixes. Enrolled devices can install the update through Settings > Windows Update > Check for Updates, and post-install builds move to 19045.7548 or 19044.7548.

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  2. 14.07.2026 21:49 1 articles · 1h ago

    Windows 10 KB5099539 hardens Secure Boot, TDI, and RDP handling

    Technical Analysis Update

    Windows 10 KB5099539 enables dynamic status reporting for Secure Boot states in Windows Security App, adds high-confidence device targeting data to expand automatic Secure Boot certificate deployment, enforces TDI transport registration requirements that can break sockets over unregistered third-party TDI transports, and adds SHA-2 certificate thumbprint support for trusted RDP publishers while retaining SHA-1 for backward compatibility. Microsoft also directs administrators to manage RDP file security through Group Policy and to check Event Viewer for Event 16003 if legacy TDI transports fail.

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