Microsoft September 2026 Security Updates

 

The Microsoft September 2026 security updates have been released and consist of 997 updates relating Microsoft, Chromium and non-Microsoft products.

Of the Microsoft CVEs released, 114 are rated Critical, 5 as low and the rest are rated Important in severity. 

At the time of release, seven are listed as being under active attack. As Indicated Dustin Childs below-linked post, 20 different patches could all be classified as wormable. "In each of these cases, a remote, unauthenticated attacker could get arbitrary code execution on affected systems with no user interaction. While some might be more exploitable than others, having 20 of them in a single release is something else."

The security updates apply to the following products, features and roles: Windows and Windows components, Office and Office Components, Azure and Azure Components, .NET and Visual Studio, Active Directory, Copilot Studio, Dynamics, Edge (Chromium-based), DHCP Server and Client, DNS Server, Exchange Server, Teams for Android, OpenSSH, Remote Desktop Client and Server, Skype for Business, Biometric Service, SQL Server, Windows Hello, Xbox, and Defender.

Information regarding known issues with KBs included in the security updates can be found at the bottom of the page at September 2026 Security Updates - Release Notes - Security Update Guide - Microsoft.

Recommended Reading:  See Dustin Childs complete review and analysis in Zero Day Initiative -- The September 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

• Security Update FAQ
• Security Updates Guide

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...

Mozilla Firefox Version 155.0.1 Released

 Mozilla sent Firefox Version 155.0.1 to the release channel. 

From the Release Notes, the update includes four fixes and one unresolved issue where standard dynamic range (SDR) video in some formats can appear washed out on macOS. 

Update:  To get the update now, select "Help" from the Firefox menu and pick "About Firefox".  Mac users need to select "About Firefox" from the Firefox menu.  If you do not use the English language version, Fully Localized Versions are available for download.

Rapid Release Calendar

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...

Mozilla Firefox Version 155.0 Released with Security Updates

 

Mozilla sent Firefox Version 155.0 to the release channel. 

The update includes 29 security updates in which 13 are rated critical, 7 rated moderate and 9 rated low. The security updates can be reviewed here.

The update also includes new features, changes and a number of fixes. To review the new features, changes and fixes, see the Release Notes.

Update:  To get the update now, select "Help" from the Firefox menu and pick "About Firefox".  Mac users need to select "About Firefox" from the Firefox menu.  If you do not use the English language version, Fully Localized Versions are available for download.

Rapid Release Calendar

Remember - "A day without laughter is a day wasted."
May the wind sing to you and the sun rise in your heart...