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Microsoft Security Response CenterCVE-2026-55127

Microsoft Word Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

7.8CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft SharePoint Server 2019
  • Microsoft Office 2019 for 32-bit editions
  • Microsoft Office 2019 for 64-bit editions
  • Microsoft 365 Apps for Enterprise for 32-bit Systems
  • Microsoft 365 Apps for Enterprise for 64-bit Systems
  • Microsoft Office LTSC for Mac 2021
  • Microsoft Office LTSC 2021 for 64-bit editions
  • Microsoft Office LTSC 2021 for 32-bit editions
  • Microsoft Office LTSC 2024 for 32-bit editions
  • Microsoft Office LTSC 2024 for 64-bit editions
  • Microsoft Office LTSC for Mac 2024
  • Microsoft Word 2016 (32-bit edition)
  • Microsoft Word 2016 (64-bit edition)
  • Microsoft SharePoint Server Subscription Edition
  • Microsoft Office 365 for Mac
  • Microsoft SharePoint Enterprise Server 2016

Versions the vendor lists as fixed

  • 16.0.10417.20175
  • https://aka.ms/OfficeSecurityReleases
  • 16.111.26071215
  • 16.0.5561.1000
  • 16.0.19725.20434
  • 16.0.5561.1001
Next step

What the vendor recommends

Click to Run Release Notes Install KB5002883. Install KB5002885. Install KB5002890. Install KB5002882. Install KB5002891. Install KB5002892.

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. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory