CVE-2023-23397

Exploited in the Wild ✓ Confirmed 0-Day ★ Google Project Zero

Triaged: March 3, 2026 21 articles

VulnLookup ↗ NVD ↗ MITRE ↗ Advisory ↗ P0 Sheet ↗ CISA KEV ↗

EPSS Score

Source: FIRST.org · 2026-05-24

93.49%

probability

This CVE has a 93.49% probability of being exploited in the next 30 days.

0% Top 99.8th percentile of all CVEs 100%

CVSS v3.1

Source: NVD

9.8

CRITICAL

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

Description

NVD

Microsoft Outlook Elevation of Privilege Vulnerability

Affected Products

microsoft

365 apps

microsoft

office

microsoft

office long term servicing channel

microsoft

outlook

Attack Intelligence

CWE-1390 · Weak Authentication CWE-20 · Improper Input Validation CWE-284 · Improper Access Control CWE-287 · Improper Authentication CWE-294 · Authentication Bypass by Capture-replay CWE-707 · Improper Neutralization

Google Project Zero

Patched

March 14, 2023

Reported by

CERT-UA, Microsoft Incident, Microsoft Threat Intelligence (MSTI)

Root Cause Analysis

???

Exploits & PoC

api0cradle/CVE-2023-23397-POC-Powershell

PoC CVE-2023-23397 — api0cradle/CVE-2023-23397-POC-Powershell

347

sqrtZeroKnowledge/CVE-2023-23397_EXPLOIT_0DAY

Exploit for the CVE-2023-23397

159

Trackflaw/CVE-2023-23397

Simple PoC of the CVE-2023-23397 vulnerability with the payload sent by email.

127

ka7ana/CVE-2023-23397

Simple PoC in PowerShell for CVE-2023-23397

tiepologian/CVE-2023-23397

Proof of Concept for CVE-2023-23397 in Python

Muhammad-Ali007/OutlookNTLM_CVE-2023-23397

PoC CVE-2023-23397 — Muhammad-Ali007/OutlookNTLM_CVE-2023-23397

BronzeBee/cve-2023-23397

Python script for sending e-mails with CVE-2023-23397 payload using SMTP

BillSkiCO/CVE-2023-23397_EXPLOIT

Generates meeting requests taking advantage of CVE-2023-23397. This requires the outlook thick client to send.

vlad-a-man/CVE-2023-23397

CVE-2023-23397 PoC

9 repos — triés par ⭐ Rechercher sur GitHub ↗

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397

Patch Vendor Advisory

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397

Patch Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-23397

US Government Resource

Signal Intelligence

Confidenceⓘ

92%

EPSS 93.49%

CVSS v3.1 9.8

Mentions 21

Last Seen May 27, 2026

CNA Information

Analyst Note

CVE-2023-23397 is a critical Microsoft Outlook elevation of privilege vulnerability with a CVSS score of 9.8, documented by CERT-EU and researched by Google Project Zero, providing strong technical validation. The confirmed status is well-justified by the severity rating and authoritative source documentation, though inclusion in CISA KEV would provide additional confidence.