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Microsoft Security Response CenterCVE-2026-20945

Microsoft SharePoint Server Spoofing Vulnerability

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

Read the vendor bulletin Get alerts for Microsoft SharePoint Enterprise Server
4.6CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft SharePoint Enterprise Server 2016
  • Microsoft SharePoint Server 2019
  • Microsoft SharePoint Server Subscription Edition

Versions the vendor lists as fixed

  • 16.0.5548.1003
  • 16.0.10417.20114
  • 16.0.19725.20210
Next step

What the vendor recommends

Install KB5002861. Install KB5002862. Install KB5002854. Install KB5002856. Install KB5002853.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-20945View CVSS, KEV, EPSS, and threat context
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