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Microsoft Security Response CenterCVE-2026-78439

Microsoft Office Graphics Component Remote Code Execution Vulnerability

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Microsoft Office LTSC for Mac
8.8CVSS 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
  • Microsoft Office 365 for Mac

Versions the vendor lists as fixed

  • 16.0.20430.20000
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.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-78439View CVSS, KEV, EPSS, and threat context
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