CVE-2026-40359ImportantMonitor
Microsoft Excel Remote Code Execution Vulnerability
Severity Important · Urgency Monitor
Why it matters: Important severity (CVSS 7.8)
Remote Code Execution · Important · CVSS 7.8. Affects: Office Online Server, Microsoft Office, Microsoft 365 Apps, Microsoft Office LTSC for Mac, Microsoft Office LTSC, Microsoft Excel.
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