Improper input validation in Microsoft 365 Apps For Enterprise
CVE-2023-23397
Microsoft Outlook Elevation of Privilege Vulnerability
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.934 (99.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C.
Affected products
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Office 2019 — versions 19.0.0
- Microsoft Office Ltsc 2021 — versions 16.0.1
- Microsoft Outlook 2013 Service Pack 1 — versions 15.0.0.0
- Microsoft Outlook 2016 — versions 16.0.0.0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
- api0cradle/CVE-2023-23397-POC-Powershell
- sqrtZeroKnowledge/CVE-2023-23397_EXPLOIT_0DAY
- Trackflaw/CVE-2023-23397
- ka7ana/CVE-2023-23397
- tiepologian/CVE-2023-23397
- Muhammad-Ali007/OutlookNTLM_CVE-2023-23397
- BronzeBee/cve-2023-23397
- djackreuter/CVE-2023-23397-PoC
- vlad-a-man/CVE-2023-23397
- BillSkiCO/CVE-2023-23397_EXPLOIT
References
- Microsoft Outlook Elevation of Privilege Vulnerability (vendor-advisory)
Frequently asked questions
- What is CVE-2023-23397?
- CVE-2023-23397 is a critical-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2023-03-14.
- How severe is CVE-2023-23397?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2023-23397 known to be exploited?
- Yes. CVE-2023-23397 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-14), indicating it is being actively exploited. 127 public proof-of-concept repositories are indexed.