CVE DATABASE / CVE-2023-23397
CVE-2023-23397
Microsoft Office Outlook Privilege Escalation Vulnerability
CVSS 9.8 · CRITICAL
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2023-03-14.
Federal remediation due 2023-04-04.
Required action: Apply updates per vendor instructions.
Summary
Microsoft Outlook Elevation of Privilege Vulnerability
CVSS 3.1 breakdown
| 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 |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft 365 appsMicrosoft officeMicrosoft office long term servicing channelMicrosoft outlook
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References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-23397
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-27. Always verify against the vendor advisory before acting.