Microsoft · Security update · September 8, 2026

KB5123099: September 2026 cumulative update for Windows 10 1607

KB5123099, released September 8, 2026, fixes 562 CVEs across 7 products. One of them is being exploited (CVE-2026-85880); 1 on CISA KEV. Patch Radar priority: Patch now.

Patch now1 on CISA KEV

CVEs closed

562

49 rated Critical

Exploited

CVE-2026-85880

Exploitation more likely

Microsoft's assessment

Highest EPSS

0.0280

86th percentile

Priority of the 562 CVEs

Patch now 1
                                Urgent 87
                                High 354
                                Routine 120

Applies to

Product	Build after install
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems	14393.9512
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems	14393.9512
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016	14393.9512
Windows 10 Version 1607 for 32-bit Systems	14393.9512
Windows 10 Version 1607 for x64-based Systems	14393.9512
Windows Server 2016	14393.9512
Windows Server 2016 (Server Core installation)	14393.9512

CVEs this fix closes

Priority	CVE	Component	Impact	CVSS	EPSS	Exploitation
Patch now	CVE-2026-85880	Windows ALPC	Elevation of Privilege	7.8	0.0039	KEVExploited
Urgent	CVE-2026-69845	Windows DHCP Server	Remote Code Execution	9.8	0.0102	Exploitation Less Likely
Urgent	CVE-2026-69525	Windows Remote Desktop Services	Remote Code Execution	9.8	0.0097	More likely
Urgent	CVE-2026-69579	Windows Message Queuing	Remote Code Execution	9.8	0.0097	Exploitation Unlikely
Urgent	CVE-2026-69590	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-69595	Windows Services for NFS ONCRPC XDR Driver	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-69730	Windows DNS	Remote Code Execution	9.8	0.0097	More likely
Urgent	CVE-2026-69769	Windows HTTP Print Provider	Remote Code Execution	9.8	0.0097	Exploitation Unlikely
Urgent	CVE-2026-69829	Windows Shell	Remote Code Execution	9.8	0.0097	Exploitation Unlikely
Urgent	CVE-2026-70296	Windows Imaging Component	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-72979	Windows DHCP Server	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-72982	Windows Netlogon	Remote Code Execution	9.8	0.0097	Exploitation Unlikely
Urgent	CVE-2026-72983	Windows Internet Connection Sharing (ICS)	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-73009	Windows Secure Socket Tunneling Protocol (SSTP)	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-77493	Microsoft Graphics Component	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-78445	Windows Services for NFS ONCRPC XDR Driver	Remote Code Execution	9.8	0.0097	Exploitation Less Likely
Urgent	CVE-2026-72950	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	8.8	0.0092	Exploitation Unlikely
Urgent	CVE-2026-69712	Windows Key Distribution Center	Remote Code Execution	8.8	0.0091	Exploitation Less Likely
Urgent	CVE-2026-72959	Windows Routing and Remote Access Service (RRAS)	Remote Code Execution	8.8	0.0091	Exploitation Less Likely
Urgent	CVE-2026-69723	Windows Kernel	Information Disclosure	5.7	0.0089	More likely
Urgent	CVE-2026-69499	Windows Imaging Component	Remote Code Execution	8.8	0.0082	Exploitation Less Likely
Urgent	CVE-2026-69518	Windows Remote Desktop	Remote Code Execution	8.8	0.0082	Exploitation Less Likely
Urgent	CVE-2026-69601	Microsoft Windows Media Foundation	Remote Code Execution	8.8	0.0082	Exploitation Less Likely
Urgent	CVE-2026-69860	Windows Imaging Component	Remote Code Execution	8.8	0.0082	Exploitation Unlikely
Urgent	CVE-2026-70203	Windows Media Player	Remote Code Execution	8.8	0.0082	Exploitation Less Likely

Released the same day

KB4011160
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002644
Microsoft Publisher 2016 (32-bit edition), Microsoft Publisher 2016 (64-bit edition)
KB5002898
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002904
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition)
KB5002908
Microsoft SharePoint Server Subscription Edition
KB5002910
Office Online Server
KB5002912
Microsoft Access 2016 (32-bit edition), Microsoft Access 2016 (64-bit edition)
KB5002913
Microsoft Access 2016 (32-bit edition), Microsoft Access 2016 (64-bit edition), Microsoft Office 2016 (32-bit edition) and 1 more
KB5002914
Microsoft Excel 2016 (32-bit edition), Microsoft Excel 2016 (64-bit edition)
KB5002916
Microsoft Office 2016 (32-bit edition), Microsoft Office 2016 (64-bit edition), Microsoft Word 2016 (32-bit edition) and 1 more
KB5002919
Microsoft Outlook 2016 (32-bit edition), Microsoft Outlook 2016 (64-bit edition)
KB5002920
Microsoft PowerPoint 2016 (32-bit edition), Microsoft PowerPoint 2016 (64-bit edition)

Vendor advisory

https://support.microsoft.com/help/5123099

Our write-up

September 2026 Patch Tuesday: The Update Pipeline Was the Attack Surface

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/fix/microsoft/kb5123099">KB5123099 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Which machines still need it?

Patchblox reads the OS build on every Windows machine, from Intune, ConfigMgr or its own agent, and shows which ones are still below the fixed build.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.