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CVE-2026-55133ImportantMonitor

Microsoft OneNote Remote Code Execution Vulnerability

Severity Important  ·  Urgency Monitor

Why it matters: Important severity (CVSS 7.8)

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

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

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

Related changes

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