M365 Change Tracker

← All changes · security · CVE-2026-78439

CVE-2026-78439CriticalMonitor

Microsoft Office Graphics Component Remote Code Execution Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 8.8)

Remote Code Execution · Critical · CVSS 8.8. Affects: Microsoft Office LTSC for Mac, Microsoft Office for Android, Microsoft Office 365 for Mac.

CVSS 8.8Security update published 2026-09-08Applies to Cloud + on-premisesNVD

Affected: Microsoft Office LTSC for Mac, Microsoft Office for Android, Microsoft Office 365 for Mac

Related changes

Change history

2026-09-08 · First captured by tracker

View at Microsoft →