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CVE-2026-40360ImportantMonitor

Microsoft Excel Information Disclosure Vulnerability

Severity Important  ·  Urgency Monitor

Why it matters: Important severity (CVSS 7.8)

Information Disclosure · Important · CVSS 7.8. Affects: Office Online Server, Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC, Microsoft Excel.

CVSS 7.8EPSS 0.4%Update published 2026-06-23Source updated 2026-06-23KB5002871NVD

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

Change history

2026-06-23 · First seen

View at Microsoft →