2026-10 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 for x64 (KB5128927)

2026-10 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 for x64 KB5128927...

October 13, 2026—KB5126836 (Monthly Rollup)

October 13, 2026—KB5126836 Monthly Rollup Applies To Windows Server 2012 R2 ESU Important Windows Server 2012 R2 reached the end of support on October 10, 2023. The Extended Security Updates ESU program for Windows Server 2012 R2 ended on October 13, 2026. This update is the final security update...

September 8, 2026—KB5123066 (Monthly Rollup)

September 8, 2026—KB5123066 Monthly Rollup Applies To Windows Server 2012 R2 ESU 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...

October 13, 2026-Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 R2 (KB5127664)

October 13, 2026-Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 R2 KB5127664 Applies To .NET Note Applies to: Microsoft .NET Framework 3.5 Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled devi...

October 13, 2026-Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 (KB5127668)

October 13, 2026-Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 KB5127668 Applies To .NET Note Applies to: Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7.2 Important The...

KB5127356: Servicing stack update for Windows Server 2012 R2: October 13, 2026

KB5127356: Servicing stack update for Windows Server 2012 R2: October 13, 2026 Applies To Windows Server 2012 R2 ESU Summary This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates SSU makes sure that you have a...

October 13, 2026-Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 R2 (KB5127688)

October 13, 2026-Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 R2 KB5127688 Applies To .NET Note Applies to: Microsoft .NET Framework 4.8 Important The installation of this Extended Security Update ESU might fail when you try to install it on an Azure Arc-enabled devi...

KB5126836: Windows Server 2012 R2 Security Update (October 2026)

The remote Windows host is missing security update 5126836. It is, therefore, affected by multiple vulnerabilities - Use after free in Windows Message Queuing Queue Manager allows an unauthorized attacker to execute code over a network. CVE-2026-100202 - Heap-based buffer overflow in Network Poli...

KB5126773: Cumulative security update for Internet Explorer: October 13, 2026

KB5126773: Cumulative security update for Internet Explorer: October 13, 2026 Applies To Windows Server 2012 R2 ESU Windows Server 2012 ESU Important End of support information: Windows Server 2012 and Windows Server 2012 R2 reached the end of support on October 10, 2023. The Extended Security...

September 14, 2026—KB5129243 (Monthly Rollup) Out-of-band

September 14, 2026—KB5129243 Monthly Rollup Out-of-band Applies To Windows Server 2012 R2 ESU 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,...

KB5123499: Servicing stack update for Windows Server 2012 R2: September 8, 2026

KB5123499: Servicing stack update for Windows Server 2012 R2: September 8, 2026 Applies To Windows Server 2012 R2 ESU Summary This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates SSU makes sure that you have a...

KB5123066: Windows Server 2012 R2 Security Update (September 2026)

The remote Windows host is missing security update 5123066. It is, therefore, affected by multiple vulnerabilities - Heap-based buffer overflow in Windows USB Mass Storage Class Driver allows an unauthorized attacker to execute code over a network. CVE-2026-68839 - Integer underflow wrap or...

2026-08 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 for x64 (KB5121649)

A security issue has been identified in a Microsoft software product that could affect your system. You can help protect your system by installing this update from Microsoft. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article...

September 8, 2026-Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 R2 (KB5120695)

September 8, 2026-Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 R2 KB5120695 Applies To .NET Note IMPORTANT This update was originally released in the Security and Quality Rollup that’s dated August 11, 2026. This update is included in the Security and Quality Rollup...

August 11, 2026-Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 R2 (KB5120706)

August 11, 2026-Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 R2 KB5120706 Applies To .NET Note Revised October 15th, 2026: Add status update to known issue section. Note Applies to: Microsoft .NET Framework 4.8 Important The installation of this Extended Security...

KB5120385: Windows Server 2012 R2 Security Update (August 2026)

The remote Windows host is missing security update 5120385. It is, therefore, affected by multiple vulnerabilities - Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network. CVE-2026-62878 - Use after free in Windows Deployment Services allows an...

July 14, 2026-Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 (KB5100991)

July 14, 2026-Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 KB5100991 Applies To .NET Note Applies to: Microsoft .NET Framework 4.6.2 Microsoft .NET Framework 4.7 Microsoft .NET Framework 4.7.1 Microsoft .NET Framework 4.7.2 Important The...

KB5123038: Cumulative security update for Internet Explorer: September 8, 2026

KB5123038: Cumulative security update for Internet Explorer: September 8, 2026 Applies To Windows Server 2012 R2 ESU Windows Server 2012 ESU Note Important Certain versions of Microsoft Internet Explorer have reached the end of support. Note that some versions of Internet Explorer may be supporte...

Microsoft Windows Kerberos: Improper exception handling vulnerability

Microsoft Windows Kerberos is a software developed by Microsoft for authentication in network clusters. As a network authentication protocol, its primary goal is to provide robust authentication services for client/server applications through a key system. There are code-related vulnerabilities i...

Microsoft Windows Deployment Services Resource Management Error Vulnerability

Microsoft Windows Deployment Services are a container for Windows deployment services an updated and redesigned version of Remote Installation Services RIS provided by Microsoft Corporation. These services allow for the setup of new computers through network-based unattended installations...