The Microsoft October 2026 security updates have been released and consist of 1,413 updates. The reason the number of updates is so large is explained by Microsoft here: Using risk cohorts to prioritize security updates.
At the time of release, two updates are listed as publicly known. As indicated in Dustin Childs blog, linked below, 59 of the October CVEs fit his definition of wormable.
The security updates apply to the following products, features and roles: Windows and Windows components, Office and Office Components, Developer Tools and .NET, SharePoint, Linux kernel, Skype for Business and Microsoft Lync, SQL Server and Dynamics, Azure and cloud services, and Exchange server.
Information regarding known issues with KBs included in the security updates can be found at the bottom of the page at October 2026 Security Updates - Release Notes - Security Update Guide - Microsoft.
Recommended Reading: See Dustin Childs complete review and analysis in Zero Day Initiative -- The October 2026 Security Update Review.
Additional Update Notes:
- Windows 10 -- See Windows 10 Extended Security Updates (ESU).
- Servicing Stack Updates -- Microsoft now combines the latest servicing stack update (SSU) for your operating system with the Latest Cumulative Updates (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
- Windows updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows, in addition to non-security updates. The updates are also available via search for the KB number in the Microsoft Update Catalog.
- For information on lifecycle and support dates for Windows 11 operating systems, please see Windows 11 Home and Pro.
- Windows Update History: Windows 11, Windows 10
References
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