Microsoft September / October 2026 Security Updates

September 2026 Security Updates

This release consists of the following 974 Microsoft CVEs:
Product Family Updates per Product/Version Vulnerabilities Addressed Distinct Updates Type of Update
Azure 1 12 4 Individual
Developer Tools 1 22 36 Cumulative
Exchange Server 1 9 4 Cumulative
Office 1 111 11 Cumulative (except 2016)
Office 2016 1 111 18 Individual
Other 1 9 9 Individual
SharePoint Server 1 16 3 Cumulative
Skype for Business 1 10 3 Cumulative
SQL 1 62 1 Cumulative
Windows 1 723 32 Cumulative

Notable CVEs
CVE ID Title Notable Item
CVE-2026-85880 Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability Exploitation Detected
CVE-2026-81963 Windows Update Stack Elevation of Privilege Vulnerability Exploitation Detected

We are republishing 25 non-Microsoft CVEs:
Security Update Guide Blog Posts
Date Blog Post
October 31, 2025 You asked, we delivered: Introducing new features for an improved security experience
October 28, 2025 Understanding CVE-2025-55315: What CISOs, security engineers, and sysadmins should know
October 22, 2025 Toward greater transparency: Introducing machine-readable Vulnerability Exploitability Xchange (VEX) for Azure Linux and beyond
November 12, 2024 Toward greater transparency: Publishing machine-readable CSAF files
June 27, 2024 Toward greater transparency: Unveiling Cloud Service CVEs
April 9, 2024 Toward greater transparency: Security Update Guide now shares CWEs for CVEs

Relevant Resources

• The new Hotpatching feature is now generally available. Please see Hotpatching feature for Windows Server Azure Edition virtual machines (VMs) for more information.
• Windows 10 and Windows 11 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10 and Windows 11, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. For information on lifecycle and support dates for Windows 10 and Windows 11 operating systems, please see Windows Lifecycle Facts Sheet.
• Microsoft is improving Windows Release Notes. For more information, please see What's next for Windows release notes.
• A list of the latest servicing stack updates for each operating system can be found in ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
• In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
• Customers running Windows Server 2008 R2, or Windows Server 2008 need to purchase the Extended Security Update to continue receiving security updates. See 4522133 for more information.

Known Issues
You can see these in more detail from the Deployments tab by selecting Known Issues column in the Edit Columns panel.

For more information about Windows Known Issues, please see Windows message center (links to currently-supported versions of Windows are in the left pane).

KB Article Applies To
5121608 Microsoft Exchange Server Subscription Edition
5121609 Microsoft Exchange Server 2019
5121610 Microsoft Exchange Server 2019 CU14
5121611 Microsoft Exchange Server 2016 CU23
5122768 Microsoft SQL Server 2022 for x64-based Systems (CU26)
5122769 Microsoft SQL Server 2025 for x64-based Systems (CU
5122770 Microsoft SQL Server 2025 for x64-based Systems (GDR)
5122771 Microsoft SQL Server 2022 for x64-based Systems (GDR)
5122772 Microsoft SQL Server 2019 for x64-based Systems (CU 32)
5122773 SQL Server 2019 GDR (Windows and Linux)
5122774 SQL Server 2017 CU31 (Windows and Linux)
5122775 SQL Server 2017 GDR (Windows and Linux)
5122871 Windows Server 2025
5122882 Windows Server 2022
Released: Sep 8, 2026

September 2026 Security Updates - Release Notes - Security Update Guide - Microsoft