What is CVE-2023-38173?

CVE-2023-38173 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Authentication Bypass by Spoofing. CVSS score: 4.3/10. Published 2023-07-21.

How severe is CVE-2023-38173?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Microsoft Edge Chromium

CVE-2023-38173

Microsoft Edge for Android Spoofing Vulnerability

Published 2023-07-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% 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 Edge Chromium
Microsoft Edge For Android — versions 1.0.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38173 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-38173?: CVE-2023-38173 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Authentication Bypass by Spoofing. CVSS score: 4.3/10. Published 2023-07-21.
How severe is CVE-2023-38173?: Medium severity. CVSS v3 base score is 4.3 out of 10.