Back to vendor advisories
Microsoft Security Response CenterCVE-2026-63516

Microsoft SharePoint Server Spoofing Vulnerability

HighVendor CVSS 6.5 / 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 perform spoofing over a network.

Products covered

  • Microsoft SharePoint Enterprise Server 2016

  • Microsoft SharePoint Server 2019

  • Microsoft SharePoint Server Subscription Edition

Remediation

Install KB5002905. Install KB5002906. Install KB5002894. Install KB5002896. Install KB5002893.

Vendor-listed fixes

  • 16.0.5565.1001

  • 16.0.10417.20198

  • 16.0.19725.20522

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.

    • The vendor changed the advisory's last-updated date.
    • The vendor changed the advisory's last-updated date.
    • 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. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.