Medium5.5Vendor: HighMicrosoft Server

Medium [CVE-2026-44821] Microsoft Office Information Disclosure Vulnerability

This medium-severity Microsoft Server advisory covers CVE-2026-44821 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.

CVE-2026-44821 Published Jun 9, 2026Updated by vendor Jul 15, 2026

CVE-2026-44821

Affected products & platforms

Microsoft ServerSharePoint Server

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Summary

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally. Affected products named by the advisory: Microsoft SharePoint Enterprise Server 2016; Microsoft SharePoint Server 2019; Microsoft SharePoint Server Subscription Edition.

Affected versions

Microsoft 365 Apps for Enterprise 16.0.1 before https://aka.ms/OfficeSecurityReleases
Microsoft Office 2016 16.0.0 before 16.0.5556.1005
Microsoft Office 2019 19.0.0 before https://aka.ms/OfficeSecurityReleases
Microsoft Office 365 for Mac 1.0.0 before 16.110.26061317
Microsoft Office LTSC 2021 16.0.1 before https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 16.0.0 before https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021 16.0.1 before 16.110.26061317
Microsoft Office LTSC for Mac 2024 16.0.0 before 16.110.26061317
Microsoft SharePoint Enterprise Server 2016 16.0.0 before 16.0.5556.1005
Microsoft SharePoint Server 2019 16.0.0 before 16.0.10417.20153
Microsoft SharePoint Server Subscription Edition 16.0.0 before 16.0.19725.20384

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions

KB5002873 (build 16.0.19725.20384)
KB5002880 (build 16.0.5556.1005)
KB5002881 (build 16.0.5556.1002)
KB5002874 (build 16.0.10417.20153)
KB5002876 (build 16.0.10417.20153)
KB5002878 (build 16.0.5556.1005)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5002873, KB5002880, KB5002881, KB5002874, KB5002876, KB5002878 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Microsoft Security Update Guide (MSRC)official
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://api.msrc.microsoft.com/cvrf/v3.0/updates; this link opens the Microsoft Server advisory index instead of the raw feed document.
Microsoft Server
Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Microsoft Server
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-44821NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5002873
Official documentation
Direct download of the KB5002873 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002880
Official documentation
Direct download of the KB5002880 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002881
Official documentation
Direct download of the KB5002881 security update named in the MSRC remediation data for this CVE.
MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

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