CVE Watch—

CVE-2023-23397

Microsoft Office Outlook Privilege Escalation Vulnerability

CVSS

—

No CVSS

EPSS

97.4%

p100

KEV

YES

Mar 14, 2023

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

97.4%EPSS · 30 days97.4%

2026-06-302026-07-16

KEV catalog record

Product

Microsoft / Office

Vulnerability

Microsoft Office Outlook Privilege Escalation Vulnerability

Added to KEV

Mar 14, 2023

Remediate by

Apr 4, 2023

Known ransomware use

Summary description

Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.

Required action

Apply updates per vendor instructions.

Notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23397, https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/, ; https://nvd.nist.gov/vuln/detail/CVE-2023-23397

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