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High 1 exploited CVE MSRC-CVE-2026-65660 1 CVE

Microsoft SharePoint Server Remote Code Execution Vulnerability

Published Aug 11, 2026 · Updated Sep 25, 2026 · Revision 3

Vendor: Microsoft

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?
Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.

I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?
Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.

How could an attacker exploit this vulnerability?
An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.

Security updates
16.0.5565.1001 — https://support.microsoft.com/help/5002905
16.0.5565.1001 — https://support.microsoft.com/help/5002906
16.0.10417.20198 — https://support.microsoft.com/help/5002894
16.0.10417.20198 — https://support.microsoft.com/help/5002896
16.0.19725.20522 — https://support.microsoft.com/help/5002893

Vulnerabilities 1

Revision history

  1. #3

    As of 9/25/2026, Microsoft had reliable evidence of observed attacks against exploitation of this vulnerability.

  2. #2

    Updated Impact in the Security Updates table, CVE Title, and FAQs. This is an informational change only.

  3. #1

    Information published.

References