March 14, 2023 · Applied Cybernetics Group
CVE-2023-23397 — Microsoft Office
Microsoft Office Outlook Privilege Escalation Vulnerability
- Added to KEV
2023-03-14- Federal due date
2023-04-04- Vendor
- Microsoft
- Product
- Office
- EPSS
- 99.9th percentile (score 0.974, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1078 , T1203 , T1550.002 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-23397
CISA short 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.