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Microsoft Security Response CenterCVE-2026-58644

Microsoft SharePoint Remote Code Execution Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft SharePoint Enterprise Server
9.8CVSS out of 10Critical 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

  • 16.0.5556.1005
  • 16.0.10417.20153
  • 16.0.19725.20384
Next step

What the vendor recommends

Install KB5002880. Install KB5002874. Install KB5002873.

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. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-58644View CVSS, KEV, EPSS, and threat context
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