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CVE-2026-55140CriticalMonitor

Microsoft Office Remote Code Execution Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 7.8)

Remote Code Execution · Critical · CVSS 7.8. Affects: Microsoft Office 365 for Mac, Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC.

CVSS 7.8EPSS 0.3%Security update published 2026-08-21Applies to Cloud + on-premisesKB5002748NVD

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

Related changes

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