High7.8Vendor: CriticalMicrosoft Server

High [CVE-2026-55127] Microsoft Word Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-55127 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.

CVE-2026-55127 Published Jul 14, 2026Updated by vendor Jul 14, 2026

CVE-2026-55127

Affected products & platforms

Microsoft ServerSharePoint Server

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Summary

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code 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
Microsoft Office 2019 19.0.0
Microsoft Office 365 for Mac 1.0.0
Microsoft Office LTSC 2021 16.0.1
Microsoft Office LTSC 2024 16.0.0
Microsoft Office LTSC for Mac 2021 16.0.1
Microsoft Office LTSC for Mac 2024 16.0.0
Microsoft SharePoint Enterprise Server 2016 16.0.0
Microsoft SharePoint Server 2019 16.0.0
Microsoft SharePoint Server Subscription Edition 16.0.0
Microsoft Word 2016 16.0.1

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Fixed versions

KB5002883 (build 16.0.10417.20175)
KB5002885 (build 16.0.10417.20175)
KB5002890 (build 16.0.5561.1000)
KB5002882 (build 16.0.19725.20434)
KB5002891 (build 16.0.5561.1001)
KB5002892 (build 16.0.5561.1001)

Official advisory · high-confidence parse· fetched 8 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5002883, KB5002885, KB5002890, KB5002882, KB5002891, KB5002892 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 8 days 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; accepted detail fields are attributed to this page.
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-2026-55127NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5002883
Official documentation
Direct download of the KB5002883 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002885
Official documentation
Direct download of the KB5002885 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5002890
Official documentation
Direct download of the KB5002890 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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