CVE-2026-45455ImportantMonitor
Microsoft Excel Information Disclosure Vulnerability
Severity Important · Urgency Monitor
Why it matters: Important severity (CVSS 3.3)
Information Disclosure · Important · CVSS 3.3. 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