The September 2026 Scan Cab is available
From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.Microsoft category: Prevent or fix issues. Read the notice and linked documentation for any recommendations or required actions; whether your tenant is affected is not known here.
What the notice says
Microsoft’s text, safely structuredUpdated September 10, 2026: The September 2026 Scan Cab includes metadata for Microsoft Office update (KB5002923). An earlier version of this notice incorrectly stated that it did not and that an additional Scan Cab would follow soon — no additional Scan Cab will be released. Deploy the September 2026 Scan Cab as normal; no further action is required.
IMPORTANT: This notice only affects environments where Scan Cab is used to check for update compliance.
What and why
The September 2026 Scan Cab was made available at 2:00 PM PDT, September 8, 2026. It helps determine whether a Windows device needs security updates without connecting to the Windows Update service.
Rollout schedule
The September 2026 Scan Cab is available now.
Who is affected
The Wsusscn2.cab file is a cabinet file that is signed by Microsoft and contains information about Microsoft security-related updates. Devices that aren't connected to the Internet can be scanned to see whether these security-related updates are present or required. The Wsusscn2.cab file doesn't contain the security updates themselves so you must obtain and install any needed security-related updates through other means.
What will happen
You can download and deploy the September 2026 Scan Cab via the usual processes. For detailed guidance, see the Additional information section below.
No action is required on environments where Scan Cab is not employed. However, please note that there might be non-Microsoft applications which utilize Scan Cab. Review the documentation for any software and update deployment tools used in your organization to understand if this is applicable in your environment.
Additional information
- Updated Scan Cab: Download the new Scan Cab here
- Announcing a smaller WSUS Scan Cab: Learn more about WSUS and the Scan Cab process
- Using WUA to Scan for Updates Offline: Windows Update Agent (WUA) can be used to scan computers for security updates without connecting to Windows Update
- WSUS and the Catalog Site: The Catalog Site used by WSUS to import updates and drivers
What changed
Between archive captures, newest first- Notice start date
8 Sep 2026→ 10 Sep 2026
IMPORTANT: This notice only affects environments whereUpdated September 10, 2026: The September 2026 Scan Cabis used to check forincludes metadata for Microsoft Office updatecompliance. What and why: The September 2026 Scan Cab was made available at 2:00 PM PDT today, September 8, 2026. It helps determine whether a Windows device needs security updates without connecting to(KB5002923). An earlier version of this notice incorrectly stated that it did not and that an additional Scan Cab would follow soon — no additional Scan Cab will be released. Deploy theWindows Update service. Note: This Scan Cab does not include metadata for Microsoft Office update (KB5002923). An additionalSeptember 2026 Scan Cab as normal; no further action is required. IMPORTANT: This notice only affects environments where Scan Cabcovering it will follow. Deploy theis used to check for update compliance. What and why: The September 2026 Scan Cabnow, and deploy the new Scan Cab when it becomes available. Rollout schedule: The September 2026 Scan Cab is available now. An additional Scan Cab with metadata for KB5002923 will follow, with timing communicated as more information becomes available.was made available at 2:00 PM PDT, September 8, 2026. It helps determine whether a Windows device needs security updates without connecting to the Windows Update service. Rollout schedule: The September 2026 Scan Cab is available now. Who is affected: The Wsusscn2.cab file is a cabinet file that is …- Notice start date
- · first version seen
Learn more
Links from the notice and their documentation checksRelated public changes
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Not confirmed here
What this page cannot tell you- Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
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