MICROSOFT PATCH REPORTS OCTOBER

This release consists of the following 1453 Microsoft CVEs:

Product Family	Vulnerabilities Addressed	Distinct Updates	Update Type
Windows	1,105	39	Cumulative
Office	164	11	Cumulative
SharePoint Server	37	1	Cumulative
SQL Server	22	8	Cumulative
Exchange Server	7	8	Cumulative
Developer Tools (Dev Div)	64	103	Mixed
Azure	15	20	Individual
Defender	4	3	Automatic
Edge	0	1	Automatic
Other	35	33	Individual
Total	1,453	227

Notable CVEs

CVE ID	Title	Notable Item
CVE-2026-96951	Windows Shell Security Feature Bypass Vulnerability	Exploitation Detected
CVE-2026-108398	.NET Framework Security Feature Bypass Vulnerability	Publicly disclosed

We are republishing 1 non-Microsoft CVE:

CNA	CVE ID	Title
Cisco Talos	CVE-2026-21413	Raw Image Extension Remote Code Execution Vulnerability

Security Update Guide Blog Posts

Date	Blog Post
October 13, 2026	Using risk cohorts to prioritize security updates
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).