M365 Change Tracker

← All changes · security · CVE-2026-78519

CVE-2026-78519CriticalMonitor

Microsoft Office Outlook Remote Code Execution Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity

Remote Code Execution · Critical. Affects: Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC, Microsoft Outlook.

Security update published 2026-09-08Applies to Cloud + on-premisesKB5002919NVD

Affected: Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC, Microsoft Outlook

Related changes

Change history

2026-09-08 · First captured by tracker

View at Microsoft →