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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Microsoft published its September 2026 security updates on September 8. The release includes critical remote code execution (RCE) updates for several Windows, Office and SQL Server product families, plus important RCE updates for SharePoint and Exchange. Microsoft also says attackers exploited two Windows privilege-escalation flaws before the updates were released; MS-ISAC separately reports in-the-wild exploitation of another flaw. Administrators should check which products and editions they run, prioritize exploited and exposed systems, then deploy and verify the applicable updates.
What did Microsoft fix on September 2026 Patch Tuesday?
Microsoft’s monthly security release was published September 8, 2026, U.S. time. Microsoft describes Update Tuesday as the second-Tuesday monthly cadence most commonly used for Windows security servicing. Its September announcement says 38 existing vulnerability records were updated; that figure is not an authoritative total count of vulnerabilities in the release.
Product families with critical RCE impact
| Product family | September 2026 impact listed |
|---|---|
| Windows 11 versions 26H1, 25H2, 24H2 and 23H2 | Critical; remote code execution |
| Windows Server 2025 and Windows Server 2022 | Critical; remote code execution |
| Windows Server 2019 and Windows Server 2016 | Critical; remote code execution |
| Microsoft Office | Critical; remote code execution |
| Microsoft SQL Server | Critical; remote code execution |
| SharePoint and Exchange | Important; remote code execution |
These are the product families and impact categories identified in Microsoft’s September announcement. Check the Security Update Guide and the relevant product KB for the affected versions and applicable packages in your environment.
Is there an Outlook spoofing or RCE vulnerability?
Yes. Microsoft Support says Outlook 2016 update KB5002919 resolves an Outlook spoofing vulnerability, an Outlook remote code execution vulnerability, and a Microsoft Office Word remote code execution vulnerability.
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Check the Outlook 2016 installation type
KB5002919 applies to the MSI-based edition of Outlook 2016. Microsoft says it does not apply to Click-to-Run editions, including Office 2016 Click-to-Run. Confirm the installation type before deploying the package; Click-to-Run installations need the applicable Click-to-Run servicing path rather than this MSI update.
Which September vulnerabilities were reported as exploited?
Microsoft’s September announcement identifies two Windows privilege-escalation flaws that were exploited before release:
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- CVE-2026-85880: Windows Advanced Local Procedure Call (ALPC) privilege escalation.
- CVE-2026-81963: Windows Update Stack privilege escalation.
These are privilege-escalation issues, not the Outlook spoofing and RCE vulnerabilities. MS-ISAC also reports that CVE-2026-65660 was exploited in the wild and added to Microsoft’s Known Exploited Vulnerability list. Treat the reports as prioritization signals and consult each CVE entry for affected products and the applicable update.
MS-ISAC warns that severe exploitation may let an attacker gain the privileges of the logged-on user. What the attacker can then do depends on those privileges; possible consequences include installing programs, viewing or changing data, deleting data, or creating accounts. A least-privileged account can limit the impact compared with an administrative account.
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How should administrators deploy the September updates?
Use the product, edition, architecture and servicing channel in your inventory to identify the correct update before deployment. Microsoft identifies Microsoft Update, Microsoft Update Catalog and enterprise deployment tooling as update paths; its Security Update Guide provides CVE, KB, product, release-date and exploitability details.
- Inventory affected products. Identify Windows, Office, Exchange, SharePoint, SQL Server and other Microsoft products in scope, including edition, architecture and servicing channel. Match each installation to the September 2026 entries in the Security Update Guide and the relevant KB articles.
- Prioritize exposure and exploitation. Put reported exploited CVEs, internet-facing services, domain controllers, mail servers and systems used by administrators near the front of the queue. Include CVE-2026-65660 as a concrete urgency signal because MS-ISAC reports in-the-wild exploitation.
- Validate update applicability. Check that the package matches the product and installation type. For example, KB5002919 is for MSI-based Outlook 2016, not Outlook 2016 Click-to-Run.
- Test, then deploy. Apply the relevant Microsoft updates after appropriate testing. Use Microsoft Update, the Microsoft Update Catalog or enterprise deployment tooling according to your environment and change controls.
- Verify and contain. Confirm installation, rescan for missing updates and monitor for service regressions. While remediation is in progress, use segmentation, least privilege and exploit-protection controls where appropriate.
- Track remediation over time. Record affected assets, update status and exceptions, and continue with automated patch management and recurring vulnerability scans as part of a documented vulnerability-management process.
What the September release figures do and do not establish
Microsoft’s announcement says 38 existing vulnerability records were updated, but the cited official passages do not give one authoritative total count of all September 2026 vulnerabilities. They also do not establish a universal CVSS ranking or a single remediation deadline. For severity and applicability decisions, use the individual CVE records in Microsoft’s Security Update Guide rather than infer a release-wide total or deadline.
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