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CVE-2023-23397

CRITICAL9.8
CISA KEV

Published 2023-03-14 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2023-23397 is a critical-severity (CVSS 9.8) vulnerability in Microsoft Office. CISA added it to the Known Exploited Vulnerabilities catalog on March 14, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 4, 2023. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

Microsoft Outlook Elevation of Privilege Vulnerability

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-20CWE-294

CISA Known-Exploited Vulnerability

Product: Microsoft — Office

Name: Microsoft Office Outlook Privilege Escalation Vulnerability

Date added: 2023-03-14 · Due: 2023-04-04

Required action: Apply updates per vendor instructions.

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