June 23, 2026—KB5095091 (OS Build 28000.2340) Preview

June 23, 2026—KB5095091 OS Build 28000.2340 Preview This cumulative update for Windows 11, version 26H1 KB5095091, includes production-quality improvements. Highlights This update is available through two release phases: gradual rollout and normal rollout. A gradual rollout delivers an update in...

June 23, 2026—KB5095093 (OS Builds 26200.8737 and 26100.8737) Preview

June 23, 2026—KB5095093 OS Builds 26200.8737 and 26100.8737 Preview ​​​​This cumulative update for Windows 11, version 25H2 and 24H2 KB5095093, includes production-quality improvements. Announcements and messages This section provides key notifications related to this release, including...

Azure File Sync Agent V22.4 - June 2026

Azure File Sync Agent V22.4 - June 2026 This article describes the improvements and issues that are fixed in the Azure File Sync Agent v22.4 release that is dated June 2026. Additionally, this article contains installation instructions for this release. Improvements and issues that are fixed Serv...

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...

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...

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...

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,...

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 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 -...

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 -...

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:​​​​​​​​​​​​​​​​​​​...

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

None None...

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...

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...

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,...

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...

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...

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...

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...

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 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...

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...

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 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 2019 Language Pack: June 9, 2026 (KB5002876)

Description of the security update for SharePoint Server 2019 Language Pack: June 9, 2026 KB5002876 Summary Important: If you're running 2013-type workflows, you mustinstall the August 2025 update for SharePoint Workflow Manager​​​​​​​ to your farm before you install this cumulative update. If...

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...

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

None None...

.NET 9.0 Update - June 9, 2026

.NET 9.0 Update - June 9, 2026 .NET 9.0 has been refreshed with the latest update as of June 9, 2026. This update contains security fixes. See the release notes for details about updated packages..NET 9.0 servicing updates are upgrades. The latest servicing update for 9.0 will remove the previous...

.NET 8.0 Update - June 9, 2026

.NET 8.0 Update - June 9, 2026 .NET 8.0 has been refreshed with the latest update as of June 9, 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...

.NET 10.0 Update - June 9, 2026

.NET 10.0 Update - June 9, 2026 .NET 10.0 has been refreshed with the latest update as of June 9, 2026. This update contains security fixes. See the release notes for details about updated packages..NET 10.0 servicing updates are upgrades. The latest servicing update for 10.0 will remove the...

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...

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...

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:...

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 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...

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...

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—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-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-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—KB5087544 (OS Builds 19045.7291 and 19044.7291)

May 12, 2026—KB5087544 OS Builds 19045.7291 and 19044.7291 Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business device...

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—Hotpatch KB5087424 (OS Build 20348.5074)

None None...

May 12, 2026—KB5087470 (Monthly Rollup)

May 12, 2026—KB5087470 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...

May 12, 2026—KB5087537 (OS Build 14393.9140)

May 12, 2026—KB5087537 OS Build 14393.9140 Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices for the past...

March 10, 2026—Hotpatch KB5078737 (OS Build 20348.4830)

None None...

May 12, 2026—KB5087545 (OS Build 20348.5139)

May 12, 2026—KB5087545 OS Build 20348.5139 This cumulative update for Windows Server 2022 KB5087545, 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...