How severe is CVE-2023-23397?

CVE-2023-23397 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-23397?

Affected package information for CVE-2023-23397 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-23397?

No fixed version has been published for CVE-2023-23397 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-23397 actively exploited in the wild?

Yes. There are 34 known exploit references for CVE-2023-23397, including 19 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-23397?

CVE-2023-23397 has an EPSS (Exploit Prediction Scoring System) score of 93.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2023-23397 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-23397 (Microsoft Office Outlook Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-03-14. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-04-04. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

CISA KEV·Added 2023-03-14 — agencies required to remediate by 2023-04-04

CVE-2023-23397

Q: Can O3 Security detect CVE-2023-23397 in my codebase?

Yes. O3 Security's Impact-Aware SCA scanner identifies CVE-2023-23397 across all affected ecosystems (multiple ecosystems), correlates it against your dependency graph, and uses function-level reachability to confirm whether the vulnerable code path is actually reachable in your application — eliminating false positives. You can scan your stack for CVE-2023-23397 directly from the O3 platform.

CRITICAL

Microsoft Outlook Elevation of Privilege Vulnerability

Published

Mar 14, 2023

Updated

Oct 27, 2025

Affected

0 pkgs

Patched

None yet

Exploits

34 known

EPSS Exploitation Probability

via FIRST.org ↗

93.4%probability of exploitation in next 30 days

Very High Risk100th percentile-0.09%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Microsoft Outlook Elevation of Privilege Vulnerability

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Microsoft Outlook Elevation of Privilege Vulnerability

portal.msrc.microsoft.comMSMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

msrc.microsoft.comGoogle-sheetMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

cisa.govCISAMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Microsoft Outlook Elevation of Privilege Vulnerability

github.comGithubMar 2023

Frequently Asked Questions

Microsoft Outlook Elevation of Privilege Vulnerability

O3 Security · Impact-Aware SCA

Is CVE-2023-23397 in your stack?

O3 detects CVE-2023-23397 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works