Description of the security update for Microsoft Exchange Server Subscription Edition RTM: October 14, 2025 (KB5066366)

Description of the security update for Microsoft Exchange Server Subscription Edition RTM: October 14, 2025 KB5066366 Original article content This security update rollup resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common...

Description of the security update for Excel 2016: October 14, 2025 (KB5002794)

Description of the security update for Excel 2016: October 14, 2025 KB5002794 Summary This security update resolves Microsoft Excel Information Disclosure Vulnerability and Microsoft Excel Remote Code Execution Vulnerability. To learn more about the vulnerabilities, see the following security...

Description of the security update for Office Online Server: October 14, 2025 (KB5002797)

Description of the security update for Office Online Server: October 14, 2025 KB5002797 Summary This security update resolves a Microsoft Excel information disclosure vulnerability, Microsoft Excel remote code execution vulnerability, Microsoft Excel remote code execution vulnerability. To learn...

Description of the security update for Office 2016: October 14, 2025 (KB5002341)

Description of the security update for Office 2016: October 14, 2025 KB5002341 Summary This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-59234. Note: To apply thi...

October 23, 2025—KB5070884 (OS Build 20348.4297) Out-of-band

October 23, 2025—KB5070884 OS Build 20348.4297 Out-of-band Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely i...

October 14, 2025-KB5066133 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2

October 14, 2025-KB5066133 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2 Release Date: October 14, 2025 Version: .NET Framework 3.5 and 4.8.1 The October 14, 2025 update for Windows 11, version 22H2 and Windows 11, version 23H2 includ...

October 14, 2025-Security and Quality Rollup for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 (KB5066741)

October 14, 2025-Security and Quality Rollup for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 KB5066741 Applies to: Microsoft .NET Framework 3.5 Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7....

October 14, 2025—KB5066872 (Monthly Rollup)

October 14, 2025—KB5066872 Monthly Rollup Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in...

October 14, 2025—KB5066877 (Security-only update)

October 14, 2025—KB5066877 Security-only update Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updat...

October 14, 2025—KB5066874 (Monthly Rollup)

October 14, 2025—KB5066874 Monthly Rollup Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in...

KB5066840: Cumulative security update for Internet Explorer: October 14, 2025

KB5066840: Cumulative security update for Internet Explorer: October 14, 2025 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 ar...

Description of the security update for PowerPoint 2016: October 14, 2025 (KB5002790)

Description of the security update for PowerPoint 2016: October 14, 2025 KB5002790 Summary This security update resolves a Microsoft PowerPoint remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-59238.​​​​​​​...

October 23, 2025—KB5070879 (OS Build 25398.1916) Out-of-band

October 23, 2025—KB5070879 OS Build 25398.1916 Out-of-band Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely i...

September 9, 2025—KB5065426 (OS Build 26100.6584)

September 9, 2025—KB5065426 OS Build 26100.6584 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updat...

October 14, 2025-Security and Quality Rollup for .NET Framework 2.0, 3.0, 3.5 SP1, 4.6.2 for Windows Server 2008 SP2 (KB5066742)

October 14, 2025-Security and Quality Rollup for .NET Framework 2.0, 3.0, 3.5 SP1, 4.6.2 for Windows Server 2008 SP2 KB5066742 Applies to: Microsoft .NET Framework 2.0 Microsoft .NET Framework 3.0 Microsoft .NET Framework 3.5 SP1 Microsoft .NET Framework 4.6.2 IMPORTANT This update is included in...

.NET 9.0 Update - October 14, 2025 (KB5068332)

.NET 9.0 Update - October 14, 2025 KB5068332 .NET 9.0 has been refreshed with the latest update as of October 14, 2025. This update contains security and non-security fixes. See the release notes for details about updated packages..NET 9.0 servicing updates are upgrades. The latest servicing upda...

October 14, 2025—KB5066873 (Monthly Rollup)

October 14, 2025—KB5066873 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 on...

Description of the security update for Microsoft Exchange Server 2016 CU23: October 14, 2025 (KB5066369)

Description of the security update for Microsoft Exchange Server 2016 CU23: October 14, 2025 KB5066369 Original article content This security update rollup resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities an...

October 14, 2025-KB5066136 Cumulative Update for .NET Framework 4.8 for Windows 10, version 1607 and Windows Server 2016

October 14, 2025-KB5066136 Cumulative Update for .NET Framework 4.8 for Windows 10, version 1607 and Windows Server 2016 Release Date: October 14, 2025 Version: .NET Framework 4.8 The October 14, 2025 update for Windows 10, version 1607 and Windows Server 2016 includes security and cumulative...

Description of the security update for SharePoint Server 2019: October 14, 2025 (KB5002796)

Description of the security update for SharePoint Server 2019: October 14, 2025 KB5002796 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 you're currently...

End of support for Office 2016 and Office 2019

None None...

Description of the security update for SharePoint Server 2016 Language Pack: October 14, 2025 (KB5002787)

Description of the security update for SharePoint Server 2016 Language Pack: October 14, 2025 KB5002787 Summary Important: If you're running Microsoft SharePoint Server 2013-type workflows, you mustinstall the August 2025 update for SharePoint Workflow Manager to your farm before you install this...

September 9, 2025—KB5065425 (OS Build 25398.1849)

September 9, 2025—KB5065425 OS Build 25398.1849 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updat...

September 9, 2025—Hotpatch KB5065474 (OS Build 26100.6508)

September 9, 2025—Hotpatch KB5065474 OS Build 26100.6508 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if...

Description of the security update for Office 2016: October 14, 2025 (KB5002792)

Description of the security update for Office 2016: October 14, 2025 KB5002792 Summary This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-59227​​​​​​​​​ Note: To...

Description of the security update for SharePoint Server Subscription Edition: October 14, 2025 (KB5002786)

Description of the security update for SharePoint Server Subscription Edition: October 14, 2025 KB5002786 Summary Important: If you're running 2013-type workflows, you must install the August 2025 update for SharePoint Workflow Manager to your farm before you install this cumulative update. If...

KB5066795: Servicing stack update for Windows Server 2012: October 14, 2025

KB5066795: Servicing stack update for Windows Server 2012: October 14, 2025 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices t...

October 14, 2025-Security Only Update for .NET Framework 2.0, 3.0, 3.5 SP1, 4.6.2 for Windows Server 2008 SP2 (KB5066749)

October 14, 2025-Security Only Update for .NET Framework 2.0, 3.0, 3.5 SP1, 4.6.2 for Windows Server 2008 SP2 KB5066749 Applies to:Microsoft .NET Framework 2.0 Microsoft .NET Framework 3.0 Microsoft .NET Framework 3.5 SP1 Microsoft .NET Framework 4.6.2 Summary Note Starting in July 2020, there wi...

KB5066794: Servicing stack update for Windows Server 2012 R2: October 14, 2025

KB5066794: Servicing stack update for Windows Server 2012 R2: October 14, 2025 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business device...

October 14, 2025-Security Only Update for .NET Framework 3.5.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2008 R2 SP1 (KB5066748)

October 14, 2025-Security Only Update for .NET Framework 3.5.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2008 R2 SP1 KB5066748 Applies to:Microsoft .NET Framework 3.5.1 Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7....

KB5066584: Servicing stack update for Windows 10, version 1607 and Windows Server 2016: October 14, 2025

KB5066584: Servicing stack update for Windows 10, version 1607 and Windows Server 2016: October 14, 2025 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain...

Support for Windows Server 2016 will end in January 2027

Support for Windows Server 2016 will end in January 2027 We recommend upgrading to the latest version of Windows Server. Running the latest version of Windows Server allows you to use the latest features – including the latest security features – and delivers the best performance.To learn more...

September 29, 2025—KB5065789 (OS Builds 26200.6725 and 26100.6725) Preview

September 29, 2025—KB5065789 OS Builds 26200.6725 and 26100.6725 Preview Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to...

September 25, 2025—KB5066198 (OS Build 19045.6396) Preview

September 25, 2025—KB5066198 OS Build 19045.6396 Preview Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if...

September 23, 2025—KB5065790 (OS Build 22631.5984) Preview

September 23, 2025—KB5065790 OS Build 22631.5984 Preview Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if...

September 22, 2025—KB5068221 (OS Build 26100.6588) Out-of-band

September 22, 2025—KB5068221 OS Build 26100.6588 Out-of-band Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely...

End of support for Office 2016 and Office 2019

None None...

Description of the security update for SharePoint Server 2019: September 09, 2025 (KB5002775)

Description of the security update for SharePoint Server 2019: September 09, 2025 KB5002775 Summary Important: ​​​​​​​​​​​​​​Prior to installing this Cumulative Update, if you're running the 2013 Style Workflows, you must install the August 2025 patch for SharePoint Workflow manager to your Farm...

KB5065226 - Description of the security update for SQL Server 2016 SP3 GDR: September 9, 2025

KB5065226 - Description of the security update for SQL Server 2016 SP3 GDR: September 9, 2025 Summary 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 security update contai...

September 9, 2025—KB5065509 (Monthly Rollup)

September 9, 2025—KB5065509 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...

September 9, 2025—KB5065430 (OS Build 10240.21128)

September 9, 2025—KB5065430 OS Build 10240.21128 Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not...

KB5065227 - Description of the security update for SQL Server 2016 SP3 Azure Connect Feature Pack: September 9, 2025

KB5065227 - Description of the security update for SQL Server 2016 SP3 Azure Connect Feature Pack: September 9, 2025 Summary 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...

KB5065223 - Description of the security update for SQL Server 2019 GDR: September 9, 2025

KB5065223 - Description of the security update for SQL Server 2019 GDR: September 9, 2025 Summary 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 security update contains...

KB5065220 - Description of the security update for SQL Server 2022 CU20: September 9, 2025

KB5065220 - Description of the security update for SQL Server 2022 CU20: September 9, 2025 Summary Improvements and fixes included in this update How to obtain and install the update How to obtain or download the latest cumulative update package for Linux More information File information...

September 9, 2025—KB5065511 (Security-only update)

September 9, 2025—KB5065511 Security-only update Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not...

Description of the security update for Office 2016: September 09, 2025 (KB5002781)

Description of the security update for Office 2016: September 09, 2025 KB5002781 Summary This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see the following security advisories: Microsoft Common Vulnerabilities and Exposur...

Description of the security update for Office 2016: September 09, 2025 (KB5002576)

Description of the security update for Office 2016: September 09, 2025 KB5002576 Summary This security update resolves a Microsoft Office remote code execution vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-54906. Note: To apply...

Description of the security update for Excel 2016: September 09, 2025 (KB5002782)

Description of the security update for Excel 2016: September 09, 2025 KB5002782 Summary This security update resolves a Microsoft Excel remote code execution vulnerability. To learn more about the vulnerability, see the following security advisories: Microsoft Common Vulnerabilities and Exposures...

Description of the security update for SharePoint Server 2016 Language Pack: September 09, 2025 (KB5002777)

Description of the security update for SharePoint Server 2016 Language Pack: September 09, 2025 KB5002777 Summary Important: ​​​​​​​Prior to installing this Cumulative Update, if you're running the 2013 Style Workflows, you must install the August 2025 patch for SharePoint Workflow manager to you...

Description of the security update for Office 2016: September 09, 2025 (KB5002762)

Description of the security update for Office 2016: September 09, 2025 KB5002762 Summary This security update resolves a Microsoft Excel information disclosure vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2025-54901.​​​​​​​​​​ Note: ...