September 10, 2026
September 2026 Microsoft Patch Tuesday
September 2026 Microsoft Patch Tuesday updates are now published in the KACE Patch Catalog. These include 92 security updates targeting various Microsoft product families and platforms supported by KACE. These patches target 891 reported vulnerabilities.
This is a list of security updates published in the Patch Catalog for this month:
| Severity | KB | Update |
|---|---|---|
| critical | KB5122774 | Security Update for SQL Server 2017 RTM CU (KB5122774) |
| critical | KB5122775 | Security Update for SQL Server 2017 RTM GDR (KB5122775) |
| critical | KB5122772 | Security Update for SQL Server 2019 RTM CU (KB5122772) |
| critical | KB5122773 | Security Update for SQL Server 2019 RTM GDR (KB5122773) |
| critical | KB5122768 | Security Update for SQL Server 2022 RTM CU (KB5122768) |
| critical | KB5122771 | Security Update for SQL Server 2022 RTM GDR (KB5122771) |
| critical | KB5122769 | Security Update for SQL Server 2025 RTM CU (KB5122769) |
| critical | KB5122770 | Security Update for SQL Server 2025 RTM GDR (KB5122770) |
| critical | KB5002914 | Security Update for Microsoft Excel 2016 (KB5002914) 64-Bit Edition |
| critical | KB4011160 | Security Update for Microsoft Office 2016 (KB4011160) 64-Bit Edition |
| critical | KB5002904 | Security Update for Microsoft Office 2016 (KB5002904) 64-Bit Edition |
| critical | KB5002915 | Security Update for Microsoft Office 2016 (KB5002915) 64-Bit Edition |
| critical | KB5002916 | Security Update for Microsoft Office 2016 (KB5002916) 64-Bit Edition |
| critical | KB5002918 | Security Update for Microsoft Office 2016 (KB5002918) 64-Bit Edition |
| critical | KB5002920 | Security Update for Microsoft PowerPoint 2016 (KB5002920) 64-Bit Edition |
| critical | KB5002914 | Security Update for Microsoft Excel 2016 (KB5002914) 32-Bit Edition |
| critical | KB4011160 | Security Update for Microsoft Office 2016 (KB4011160) 32-Bit Edition |
| critical | KB5002904 | Security Update for Microsoft Office 2016 (KB5002904) 32-Bit Edition |
| critical | KB5002915 | Security Update for Microsoft Office 2016 (KB5002915) 32-Bit Edition |
| critical | KB5002916 | Security Update for Microsoft Office 2016 (KB5002916) 32-Bit Edition |
| critical | KB5002918 | Security Update for Microsoft Office 2016 (KB5002918) 32-Bit Edition |
| critical | KB5002923 | Security Update for Microsoft Word 2016 (KB5002923) 32-Bit Edition |
| critical | KB5002910 | Security Update for Microsoft Office Online Server (KB5002910) farm-deployment |
| critical | KB5123099 | 2026-09 Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB5123099) |
| critical | KB5122874 | 2026-09 Servicing Stack Update for Windows 10 Version 1607 for x64-based Systems (KB5122874) |
| critical | KB5122876 | 2026-09 Cumulative Update for Windows 10 Version 1809 for x64-based Systems (KB5122876) |
| critical | KB5122878 | 2026-09 Cumulative Update for Windows 10 Version 21H2 for x64-based Systems (KB5122878) |
| critical | KB5122878 | 2026-09 Cumulative Update (ESU) for Windows 10 Version 22H2 for x64-based Systems (KB5122878) |
| critical | KB5126256 | 2026-09 Extended Security Updates (ESU) Licensing Preparation Package for Windows 10 Version 22H2 for x64-based Systems (KB5126256) |
| critical | KB5126424 | 2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 for x64 (KB5126424) |
| critical | KB5122880 | 2026-09 Cumulative Update for Windows 11, version 23H2 for x64-based Systems (KB5122880) |
| critical | KB5126052 | 2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for x64 (KB5126052) |
| critical | KB5124008 | 2026-09 Cumulative Update for Windows 11, version 24H2 for x64-based Systems (KB5124008) (26100.9445) |
| critical | KB5126052 | 2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for arm64 (KB5126052) |
| critical | KB5124008 | 2026-09 Cumulative Update for Windows 11, version 25H2 for arm64-based Systems (KB5124008) (26200.9445) |
| critical | KB5126052 | 2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for x64 (KB5126052) |
| critical | KB5124008 | 2026-09 Cumulative Update for Windows 11, version 25H2 for x64-based Systems (KB5124008) (26200.9445) |
| critical | KB5123066 | 2026-09 Security Monthly Quality Rollup (ESU) for Windows Server 2012 R2 for x64-based Systems (KB5123066) |
| critical | KB5123499 | 2026-09 Servicing Stack Update for Windows Server 2012 R2 for x64-based Systems (KB5123499) |
| critical | KB5123065 | 2026-09 Security Monthly Quality Rollup (ESU) for Windows Server 2012 for x64-based Systems (KB5123065) |
| critical | KB5123602 | 2026-09 Servicing Stack Update for Windows Server 2012 for x64-based Systems (KB5123602) |
| critical | KB5123099 | 2026-09 Cumulative Update for Windows Server 2016 for x64-based Systems (KB5123099) |
| critical | KB5122874 | 2026-09 Servicing Stack Update for Windows Server 2016 for x64-based Systems (KB5122874) |
| critical | KB5122876 | 2026-09 Cumulative Update for Windows Server 2019 for x64-based Systems (KB5122876) |
| critical | KB5122882 | 2026-09 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5122882) |
| critical | KB5126052 | 2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 24H2 for x64 (KB5126052) |
| critical | KB5122871 | 2026-09 Cumulative Update for Microsoft server operating system version 24H2 for x64-based Systems (KB5122871) (26100.33438) |
| important | KB5121608 | Security Update For Exchange Server Subscription Edition (KB5121608) |
| important | KB5126106 | 2026-09 .NET 10.0.12 Security Update for ARM64 Client (KB5126106) |
| important | KB5126106 | 2026-09 .NET 10.0.12 Security Update for x64 Client (KB5126106) |
| important | KB5126106 | 2026-09 .NET 10.0.12 Security Update for x64 Server (KB5126106) |
| important | KB5126104 | 2026-09 .NET 8.0.31 Security Update for ARM64 Client (KB5126104) |
| important | KB5126104 | 2026-09 .NET 8.0.31 Security Update for x64 Client (KB5126104) |
| important | KB5126104 | 2026-09 .NET 8.0.31 Security Update for x64 Server (KB5126104) |
| important | KB5126105 | 2026-09 .NET 9.0.20 Security Update for ARM64 Client (KB5126105) |
| important | KB5126105 | 2026-09 .NET 9.0.20 Security Update for x64 Client (KB5126105) |
| important | KB5126105 | 2026-09 .NET 9.0.20 Security Update for x64 Server (KB5126105) |
| important | KB5002921 | Security Update for Microsoft SharePoint Enterprise Server 2016 (KB5002921) farm-deployment |
| important | KB5002924 | Security Update for Microsoft SharePoint Enterprise Server 2016 (KB5002924) farm-deployment |
| important | KB5002912 | Security Update for Microsoft Access 2016 (KB5002912) 64-Bit Edition |
| important | KB5002898 | Security Update for Microsoft Office 2016 (KB5002898) 64-Bit Edition |
| important | KB5002913 | Security Update for Microsoft Office 2016 (KB5002913) 64-Bit Edition |
| important | KB5002917 | Security Update for Microsoft Office 2016 (KB5002917) 64-Bit Edition |
| important | KB5002919 | Security Update for Microsoft Outlook 2016 (KB5002919) 64-Bit Edition |
| important | KB5002644 | Security Update for Microsoft Publisher 2016 (KB5002644) 64-Bit Edition |
| important | KB5002646 | Security Update for Microsoft Visio 2016 (KB5002646) 64-Bit Edition |
| important | KB5002923 | Security Update for Microsoft Word 2016 (KB5002923) 64-Bit Edition |
| important | KB5002912 | Security Update for Microsoft Access 2016 (KB5002912) 32-Bit Edition |
| important | KB5002898 | Security Update for Microsoft Office 2016 (KB5002898) 32-Bit Edition |
| important | KB5002913 | Security Update for Microsoft Office 2016 (KB5002913) 32-Bit Edition |
| important | KB5002917 | Security Update for Microsoft Office 2016 (KB5002917) 32-Bit Edition |
| important | KB5002919 | Security Update for Microsoft Outlook 2016 (KB5002919) 32-Bit Edition |
| important | KB5002920 | Security Update for Microsoft PowerPoint 2016 (KB5002920) 32-Bit Edition |
| important | KB5002644 | Security Update for Microsoft Publisher 2016 (KB5002644) 32-Bit Edition |
| important | KB5002646 | Security Update for Microsoft Visio 2016 (KB5002646) 32-Bit Edition |
| important | KB5002909 | Security Update for Microsoft SharePoint Server 2019 Core (KB5002909) farm-deployment |
| important | KB5002911 | Security Update for Microsoft SharePoint Server 2019 Language Pack (KB5002911) farm-deployment |
| important | KB4576341 | Visual Studio 2017 Security Update (15.9.83) |
| important | KB4576339 | Visual Studio 2019 Security Update (16.11.60) |
| important | KB5007364 | Visual Studio 2022 Security Update (17.14.40) |
| important | KB5072533 | Visual Studio 2026 Security Update (18.9.3) |
| important | KB5126047 | 2026-09 Cumulative Update for .NET Framework 4.8 for Windows 10 Version 1607 for x64 (KB5126047) |
| important | KB5126144 | 2026-09 Cumulative Update for .NET Framework 3.5, 4.7.2 and 4.8 for Windows 10 Version 1809 for x64 (KB5126144) |
| important | KB5126145 | 2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2 for x64 (KB5126145) |
| important | KB5126146 | 2026-09 Cumulative Update (ESU) for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 for x64 (KB5126146) |
| important | KB5126148 | 2026-09 Security and Quality Rollup (ESU) for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 for x64 (KB5126148) |
| important | KB5126147 | 2026-09 Security and Quality Rollup (ESU) for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 for x64 (KB5126147) |
| important | KB5126047 | 2026-09 Cumulative Update for .NET Framework 4.8 for Windows Server 2016 for x64 (KB5126047) |
| important | KB5126144 | 2026-09 Cumulative Update for .NET Framework 3.5, 4.7.2 and 4.8 for Windows Server 2019 for x64 (KB5126144) |
| important | KB5126149 | 2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2 for x64 (KB5126149) |
| moderate | KB5123038 | 2026-09 Cumulative Security Update (ESU) for Internet Explorer 11 for Windows Server 2012 R2 for x64-based systems (KB5123038) |
| moderate | KB5123038 | 2026-09 Cumulative Security Update (ESU) for Internet Explorer 11 for Windows Server 2012 for x64-based systems (KB5123038) |