What is CVE-2023-23391?

CVE-2023-23391 is a medium-severity vulnerability in Microsoft 365 Copilot, classified under Relative Path Traversal. CVSS score: 5.5/10. Published 2023-03-14.

How severe is CVE-2023-23391?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2023-23391 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Microsoft 365 Copilot

CVE-2023-23391

Office for Android Spoofing Vulnerability

Published 2023-03-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (49.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Microsoft 365 Copilot — versions 16.0.16026.20172
Microsoft Office For Android — versions 16.0.1
Microsoft Office — versions 16.0.16026.20172

Weakness classification (CWE)

CWE-23 — Relative Path Traversal

Public proof-of-concept exploits

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23391 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-23391?: CVE-2023-23391 is a medium-severity vulnerability in Microsoft 365 Copilot, classified under Relative Path Traversal. CVSS score: 5.5/10. Published 2023-03-14.
How severe is CVE-2023-23391?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2023-23391 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.