May 12, 2026—Hotpatch KB5087423 (OS Build 26100.32772)

May 12, 2026—Hotpatch KB5087423 OS Build 26100.32772 This update applies to Windows Server 2025 Datacenter & Standard machines connected to Azure Arc. To learn more about differences between security updates, optional non-security preview updates, out-of-band OOB updates, and continuous innovatio...

June 9, 2026—KB5094122 (OS Build 14393.9234)

June 9, 2026—KB5094122 OS Build 14393.9234 Summary This article lists the security issues and quality improvements included in this cumulative security update. Windows Server 2016Windows 10, version 1607 Applies to: Windows Server 2016This security update includes fixes and improvements that are ...

June 9, 2026—KB5094123 (OS Build 17763.8880)

June 9, 2026—KB5094123 OS Build 17763.8880 Summary This article lists the security issues and quality improvements included in this cumulative security update. Windows Server 2019Windows 10, version 1809 Applies to: Windows Server 2019This security update includes fixes and quality improvements...

Description of the security update for Excel 2016: June 9, 2026 (KB5002877)

Description of the security update for Excel 2016: June 9, 2026 KB5002877 Summary This security update resolves Microsoft Excel remote code execution vulnerability and Microsoft Excel Information Disclosure vulnerability. To learn more about the vulnerabilities, see the following security...

Description of the security update for SharePoint Server 2016: June 9, 2026 (KB5002880)

Description of the security update for SharePoint Server 2016: June 9, 2026 KB5002880 Summary Important: If you're currently running SharePoint Workflow Manager, you must install the SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you're currently...

June 9, 2026—KB5094125 (OS Build 26100.32995)

June 9, 2026—KB5094125 OS Build 26100.32995 ​​​​​This cumulative update for Windows Server 2025 KB5094125, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates,...

June 9, 2026—KB5095051 (OS Build 28000.2269)

June 9, 2026—KB5095051 OS Build 28000.2269 ​​​​​This cumulative update for Windows 11, version 26H1 KB5095051 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release health dashboard for the latest...

Description of the security update for SharePoint Server Subscription Edition: June 9, 2026 (KB5002873)

Description of the security update for SharePoint Server Subscription Edition: June 9, 2026 KB5002873 Summary Important: If you're currently running SharePoint Workflow Manager, you must install SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you'r...

Security update 2026-06-09

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June 9, 2026—KB5094041 (Monthly Rollup)

June 9, 2026—KB5094041 Monthly Rollup Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012 R2. For a successful installation, please make sure all Subset of endpoints for ESU only a...

Security update 2026-06-09

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Description of the security update for Microsoft Exchange Server 2019 CU14: June 09, 2026 (KB5094142)

Description of the security update for Microsoft Exchange Server 2019 CU14: June 09, 2026 KB5094142 This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures CVE: CVE-2026-42897 -...

May 12, 2026—Hotpatch KB5089466 (OS Builds 26200.8390 and 26100.8390)

May 12, 2026—Hotpatch KB5089466 OS Builds 26200.8390 and 26100.8390 This Hotpatch update for Windows 11, version 25H2 and 24H2 KB5089466 includes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band OOB updates, and...

May 12, 2026—KB5089548 (OS Build 28000.2113)

May 12, 2026—KB5089548 OS Build 28000.2113 ​​​​​This cumulative update for Windows 11, version 26H1 KB5089548 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release health dashboard for the latest...

Security update 2026-06-09

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Security update 2026-06-09

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Description of the security update for Microsoft Exchange Server 2019 CU15: June 09, 2026 (KB5094140)

Description of the security update for Microsoft Exchange Server 2019 CU15: June 09, 2026 KB5094140 This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures CVE:​​​​​​​​​​​​​​​​​​​...

Description of the security update for Microsoft Exchange Server 2016 CU23: June 09, 2026 (KB5094144)

Description of the security update for Microsoft Exchange Server 2016 CU23: June 09, 2026 KB5094144 This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures CVE: CVE-2026-42897 -...

May 12, 2026—KB5087539(OS Build 26100.32860)

May 12, 2026—KB5087539OS Build 26100.32860 ​​​​​This cumulative update for Windows Server 2025 KB5087539, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates,...

May 12, 2026—KB5089549 (OS Builds 26200.8457 and 26100.8457)

May 12, 2026—KB5089549 OS Builds 26200.8457 and 26100.8457 This cumulative update for Windows 11, version 25H2 and 24H2 KB5089549 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release.Visit the Windows release health...

Description of the security update for Office Online Server: June 9, 2026 (KB5002875)

Description of the security update for Office Online Server: June 9, 2026 KB5002875 Summary This security update resolves Microsoft Excel remote code execution vulnerability and Microsoft Excel Information Disclosure vulnerability. To learn more about the vulnerabilities, see the following securi...

June 9, 2026—KB5094128 (OS Build 20348.5256)

June 9, 2026—KB5094128 OS Build 20348.5256 This cumulative update for Windows Server 2022 KB5094128, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates, optional...

Description of the security update for Office 2016: June 9, 2026 (KB5002852)

Description of the security update for Office 2016: June 9, 2026 KB5002852 Summary This security update resolves a Microsoft Office Remote Code Executionvulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2026-45645. Note: To apply this...

Description of the security update for SharePoint Server 2019: June 9, 2026 (KB5002874)

Description of the security update for SharePoint Server 2019: June 9, 2026 KB5002874 Summary Important: If you're currently running SharePoint Workflow Manager, you must install the SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you're currently...

June 9, 2026—KB5094127 (OS Builds 19045.7417 and 19044.7417)

June 9, 2026—KB5094127 OS Builds 19045.7417 and 19044.7417 Summary This article lists the security issues and quality improvements included in this cumulative security update. Windows 10, version 22H2Windows 10, version 21H2 Applies to: Windows 10 ESU Important: Use EKB KB5015684 to update to...

Description of the security update for Microsoft Exchange Server Subscription Edition RTM: June 09, 2026 (KB5094139)

Description of the security update for Microsoft Exchange Server Subscription Edition RTM: June 09, 2026 KB5094139 This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures CVE:...

Description of the security update for Office 2016: June 9, 2026 (KB5002878)

Description of the security update for Office 2016: June 9, 2026 KB5002878 Summary This security update resolves a Microsoft Office remote code execution vulnerability, Microsoft Office Information Disclosure Vulnerability. To learn more about the vulnerability, see the following security...

Description of the security update for SharePoint Server 2016 Language Pack: June 9, 2026 (KB5002881)

Description of the security update for SharePoint Server 2016 Language Pack: June 9, 2026 KB5002881 Summary Important: If you're running Microsoft SharePoint Server 2013-type workflows, you must install the August 2025 update for SharePoint Workflow Manager to your farm before you install this...

June 9, 2026—KB5093998 (OS Build 22631.7219)

June 9, 2026—KB5093998 OS Build 22631.7219 ​​​​​This cumulative update for Windows 11, version 23H2 KB5093998, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates,...

Description of the security update for Word 2016: June 9, 2026 (KB5002879)

Description of the security update for Word 2016: June 9, 2026 KB5002879 Summary This security update resolves a Microsoft Outlook and Word Remote Code Execution vulnerability and Microsoft Word Remote Code Execution vulnerability. To learn more about the vulnerabilities, see the following securi...

June 9, 2026—KB5094042 (Monthly Rollup)

June 9, 2026—KB5094042 Monthly Rollup Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012. For a successful installation, please make sure all Subset of endpoints for ESU only are...

June 9, 2026—KB5094126 (OS Builds 26200.8655 and 26100.8655)

June 9, 2026—KB5094126 OS Builds 26200.8655 and 26100.8655 This cumulative update for Windows 11, version 25H2 and 24H2 KB5094126 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release.Visit the Windows release health...

KB5094006: Cumulative security update for Internet Explorer: June 9, 2026

KB5094006: Cumulative security update for Internet Explorer: June 9, 2026 Important Certain versions of Microsoft Internet Explorer have reached the end of support. Note that some versions of Internet Explorer may be supported past the latest OS end date when Extended Security Updates ESUs are...

Description of the security update for SharePoint Server 2019: May 12, 2026 (KB5002870)

Description of the security update for SharePoint Server 2019: May 12, 2026 KB5002870 Summary Important: If you're currently running SharePoint Workflow Manager, you must install the SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you're currently...

Description of the security update for SharePoint Server Subscription Edition: May 12, 2026 (KB5002863)

Description of the security update for SharePoint Server Subscription Edition: May 12, 2026 KB5002863 Summary Important: If you're currently running SharePoint Workflow Manager, you must install SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you'r...

Description of the security update for SharePoint Server 2016: May 12, 2026 (KB5002868)

Description of the security update for SharePoint Server 2016: May 12, 2026 KB5002868 Summary Important: If you're currently running SharePoint Workflow Manager, you must install the SharePoint Workflow Manager KB5002799 to your farm before you install this cumulative update. If you're currently...

May 26, 2026-KB5092430 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2

May 26, 2026-KB5092430 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 Release Date: May 26, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 26, 2026 update for Windows 11, version 24H2 includes security and cumulative reliability improvements in .NET...

May 26, 2026—KB5089570 (OS Build 28000.2179) Preview

May 26, 2026—KB5089570 OS Build 28000.2179 Preview ​​​​This cumulative update for Windows 11, version 26H1 KB5083806, includes production-quality improvements. Visit the Windows release health dashboard for the latest status on this release. Highlights This update is available through two release...

May 26, 2026—KB5089573 (OS Builds 26200.8524 and 26100.8524) Preview

May 26, 2026—KB5089573 OS Builds 26200.8524 and 26100.8524 Preview ​​​​This cumulative update for Windows 11, version 25H2 and 24H2 KB5089573, includes production-quality improvements. Visit the Windows release health dashboard for the latest status on this release. Announcements and messages Thi...

May 26, 2026-KB5092427 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2

May 26, 2026-KB5092427 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 Release Date: May 26, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 26, 2026 update for Windows 11, version 25H2 includes security and cumulative reliability improvements in .NET...

May 12, 2026-KB5087059 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows Server 2022

May 12, 2026-KB5087059 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows Server 2022 Release Date: May 12, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 12, 2026 update for Windows Server 2022 includes security and cumulative reliability improvements in .NET Framework 3.5 and...

May 12, 2026-KB5087058 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2

May 12, 2026-KB5087058 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 Release Date: May 12, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 12, 2026 update for Windows 11, version 23H2 includes security and cumulative reliability improvements in .NET Framework...

May 12, 2026-KB5087053 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 and Windows 10 Version 22H2

May 12, 2026-KB5087053 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 and Windows 10 Version 22H2 Release Date: May 12, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 12, 2026 update for Windows 10 Version 21H2 and Windows 10 Version 22H2 includes security and...

.NET 8.0 Update - May 12, 2026

.NET 8.0 Update - May 12, 2026 .NET 8.0 has been refreshed with the latest update as of May 12, 2026. This update contains security fixes. See the release notes for details about updated packages..NET 8.0 servicing updates are upgrades. The latest servicing update for 8.0 will remove the previous...

KB5089899 - Description of the security update for SQL Server 2025 CU4: May 12, 2026

KB5089899 - Description of the security update for SQL Server 2025 CU4: May 12, 2026 Applies To SQL Server 2025 on Windows all editions, SQL Server 2025 on Linux all editions Summary Known issues in this update Improvements and fixes included in this update How to obtain and install the update Ho...

May 12, 2026-KB5087051 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 and Microsoft server operating system 24H2

May 12, 2026-KB5087051 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 and Microsoft server operating system 24H2 Release Date: May 12, 2026 Version: .NET Framework 3.5 and 4.8.1 The May 12, 2026 update for Windows 11, version 25H2 and Microsoft server operating...

Update 27.6 for Microsoft Dynamics 365 Business Central 2025 Release Wave 2 (Application Build 27.6.48260, Platform Build 27.0.48102)

Update 27.6 for Microsoft Dynamics 365 Business Central 2025 Release Wave 2 Application Build 27.6.48260, Platform Build 27.0.48102 Overview This update replaces previously released updates. You should always install the latest update.After you install this hotfix, you might have to update your...

KB5090354 - Description of the security update for SQL Server 2017 CU31: May 12, 2026

KB5090354 - Description of the security update for SQL Server 2017 CU31: May 12, 2026 Summary Known issues in this update Improvements and fixes included in this update How to obtain and install the update More information File information Information about protection and security Summary This...

May 12, 2026—KB5087420 (OS Build 22631.7079)

May 12, 2026—KB5087420 OS Build 22631.7079 ​​​​​This cumulative update for Windows 11, version 23H2 KB5087420, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. To learn more about differences between security updates,...

May 12, 2026—KB5087471 (Monthly Rollup)

May 12, 2026—KB5087471 Monthly Rollup Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012 R2. For a successful installation, please make sure all Subset of endpoints for ESU only a...