CVE-2023-23397
Microsoft Office Outlook Privilege Escalation Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 4 April 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Outlook Elevation of Privilege Vulnerability
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 97.16% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 14 March 2023 · due 4 April 2023
- Weakness
- CWE-20, CWE-294
- Affected
- microsoft/365 apps · microsoft/office · microsoft/office long term servicing channel · microsoft/outlook
- Source
- secure@microsoft.com
EPSS 97.2% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. 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
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397Patch, Vendor Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-23397US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.