CVE-2023-23397: Microsoft Office Outlook Privilege Escalation Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2023-03-14. EPSS: 97.2% chance of exploitation in the next 30 days.

Microsoft Outlook Elevation of Privilege Vulnerability

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office: version 2019 only
• Microsoft Office Long Term Servicing Channel: version 2021 only
• Microsoft Outlook: version 2013 only; version 2016 only

Published 2023-03-14. Last modified 2026-06-17.