CVE-2021-34478: Microsoft 365 Apps

High severity, CVSS 7.8. EPSS: 51.5% chance of exploitation in the next 30 days.

Microsoft Office Remote Code Execution Vulnerability

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office: version 2019 only

Published 2021-08-12. Last modified 2026-08-10.