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...

May 12, 2026—KB5087537 (OS Build 14393.9140)

May 12, 2026—KB5087537 OS Build 14393.9140 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...

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—KB5087544 (OS Builds 19045.7291 and 19044.7291)

May 12, 2026—KB5087544 OS Builds 19045.7291 and 19044.7291 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...

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—KB5087541 (OS Build 25398.2330)

May 12, 2026—KB5087541 OS Build 25398.2330 This cumulative update for Windows Server, version 23H2 KB5087541, 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,...

April 19, 2026—KB5091572 (OS Build 14393.9062) Out-of-band

April 19, 2026—KB5091572 OS Build 14393.9062 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 if...

April 14, 2026—KB5082200 (OS Builds 19045.7184 and 19044.7184)

April 14, 2026—KB5082200 OS Builds 19045.7184 and 19044.7184 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...

March 10, 2026—KB5078938 (OS Build 14393.8957)

March 10, 2026—KB5078938 OS Build 14393.8957 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 ...

March 10, 2026—KB5078752 (OS Build 17763.8511)

March 10, 2026—KB5078752 OS Build 17763.8511 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 ...

March 10, 2026—Hotpatch KB5078736 (OS Build 26100.32463)

March 10, 2026—Hotpatch KB5078736 OS Build 26100.32463 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...

KB5078738: Cumulative security update for Internet Explorer: March 10, 2026

KB5078738: Cumulative security update for Internet Explorer: March 10, 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...

March 10, 2026—KB5078883 (OS Build 22631.6783)

March 10, 2026—KB5078883 OS Build 22631.6783 ​​​​​This cumulative update for Windows 11, version 23H2 KB5078883, 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 update...

March 2, 2026—KB5082314 (OS Build 20348.4776) Out-of-band

March 2, 2026—KB5082314 OS Build 20348.4776 Out-of-band This out-of-band update for Windows Server 2022 KB5082314 is cumulative. It includes updates from previous security updates, along with an additional fix. To learn more about differences between security updates, optional non-security previe...

February 10, 2026—Hotpatch KB5075942 (OS Build 26100.32313)

February 10, 2026—Hotpatch KB5075942 OS Build 26100.32313 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...

February 10, 2026—Hotpatch KB5075943 (OS Build 20348.4711)

February 10, 2026—Hotpatch KB5075943 OS Build 20348.4711 This Hotpatch update for Windows Server 2022 KB5075943, improves functionality, performance, and reliability. To learn more about differences between security updates, optional non-security preview updates, out-of-band OOB updates, and...

January 24, 2026—KB5078129 (OS Builds 19045.6812 and 19044.6812) Out-of-band

January 24, 2026—KB5078129 OS Builds 19045.6812 and 19044.6812 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...

Linux Distros Unpatched Vulnerability : CVE-2026-21265

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Windows Secure Boot stores Microsoft certificates in the UEFI KEK and DB. These original certificates are approaching expiration, and devices containing affecte...

January 17, 2026—KB5077795 (OS Build 17763.8280) Out-of-band

January 17, 2026—KB5077795 OS Build 17763.8280 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...

January 17, 2026—KB5077796 (OS Builds 19045.6811 and 19044.6811) Out-of-band

January 17, 2026—KB5077796 OS Builds 19045.6811 and 19044.6811 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...