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Microsoft Security Response CenterCVE-2026-66805

Microsoft SharePoint Server Remote Code Execution Vulnerability

HighVendor CVSS 8.8 / 10 1 CVE Published Aug 11, 2026 at 7:00 AM UTC

Summary

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Products covered

  • Microsoft SharePoint Server Subscription Edition

Remediation

Install KB5002927.

Vendor-listed fixes

  • 16.0.20326.20190

CVEs in this advisory 1

Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Removed affected products: Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019.
    • Added fixed versions: 16.0.20326.20190.
    • Removed fixed versions: 16.0.5565.1001, 16.0.10417.20198, 16.0.19725.20522.
    • The vendor changed its remediation guidance.
    • The vendor changed its remediation guidance.

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.