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Microsoft Security Response CenterCVE-2026-42831

Microsoft Office Remote Code Execution Vulnerability

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

Read the vendor bulletin Get alerts for Microsoft Office LTSC for Mac
7.8CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft Office LTSC for Mac 2021
  • Microsoft Office for Android
  • Microsoft Office LTSC for Mac 2024

Versions the vendor lists as fixed

  • 16.109.26051019
  • 16.0.19822.20190
Next step

What the vendor recommends

Release Notes

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

CVE-2026-42831View CVSS, KEV, EPSS, and threat context
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