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CVE-2026-55045CriticalMonitor

Microsoft Office Remote Code Execution Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 8.4)

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

CVSS 8.4EPSS 0.4%Security update published 2026-08-21Applies to Cloud + on-premisesKB5002891NVD

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

Related changes

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