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CVE-2026-78518ImportantMonitor

Microsoft Office Excel Remote Code Execution Vulnerability

Severity Important  ·  Urgency Monitor

Why it matters: Important severity (CVSS 8.8)

Remote Code Execution · Important · CVSS 8.8. Affects: Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC, Microsoft Excel, Microsoft Office 365 for Mac.

CVSS 8.8Security update published 2026-09-08Applies to Cloud + on-premisesKB5002914NVD

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

Related changes

Change history

2026-09-08 · First captured by tracker

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