High [CVE-2026-55033] Microsoft Word Remote Code Execution Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-55033 affecting Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition.
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Summary
Integer overflow or wraparound 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.
- 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
- KB5002883 (build 16.0.10417.20175)
- KB5002885 (build 16.0.10417.20175)
- KB5002890 (build 16.0.5561.1000)
- KB5002891 (build 16.0.5561.1001)
- KB5002892 (build 16.0.5561.1001)
- KB5002882 (build 16.0.19725.20434)
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Install the applicable security update for your platform: KB5002883, KB5002885, KB5002890, KB5002891, KB5002892, KB5002882 (see the Microsoft Update Catalog).
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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