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CVE-2026-40366CriticalMonitor

Microsoft Word Remote Code Execution Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 8.4)

Remote Code Execution · Critical · CVSS 8.4. Affects: Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC, Microsoft Word.

CVSS 8.4EPSS 0.4%Update published 2026-06-23Source updated 2026-06-23KB5002858NVD

Affected: Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC, Microsoft Word

Change history

2026-06-23 · First seen

View at Microsoft →