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Advisory severityMedium6.5Vendor: HighMicrosoft Server

Medium [CVE-2026-58639] Microsoft SharePoint Server Spoofing Vulnerability

This medium-severity Microsoft Server advisory covers CVE-2026-58639 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-58639 Source published Source updated

VulniPulse record published Record updated

CVE-2026-58639
Affected products & platforms
Microsoft ServerSharePoint Server
Open source advisory

Summary

Microsoft SharePoint Server Spoofing Vulnerability

Affected products named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

Is CVE-2026-58639 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-58639 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-58639?

Upgrade to a fixed release named by Microsoft:

  • KB5002905 (build 16.0.5565.1001)
  • KB5002906 (build 16.0.5565.1001)
  • KB5002894 (build 16.0.10417.20198)
  • KB5002896 (build 16.0.10417.20198)
  • KB5002893 (build 16.0.19725.20522)

Confirm against the vendor advisory before you patch.

Affected versions
  • Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5565.1001
  • Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20198
  • Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.19725.20522

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

Fixed versions
  • KB5002905 (build 16.0.5565.1001)
  • KB5002906 (build 16.0.5565.1001)
  • KB5002894 (build 16.0.10417.20198)
  • KB5002896 (build 16.0.10417.20198)
  • KB5002893 (build 16.0.19725.20522)

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Install the applicable security update for your platform: KB5002905, KB5002906, KB5002894, KB5002896, KB5002893 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

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