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Microsoft Security Response CenterCVE-2026-42831

Microsoft Office Remote Code Execution Vulnerability

CriticalVendor CVSS 7.8 / 10 1 CVE Published May 12, 2026 at 7:00 AM UTC

Summary

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

Products covered

  • Microsoft Office LTSC for Mac 2021

  • Microsoft Office for Android

  • Microsoft Office LTSC for Mac 2024

Remediation

Release Notes

Vendor-listed fixes

  • 16.109.26051019

  • 16.0.19822.20190

CVEs in this advisory 1

Updates

  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.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.