What is CVE-2018-8425?

CVE-2018-8425 is a medium-severity vulnerability in Microsoft Edge, classified under Authentication Bypass by Spoofing. CVSS score: 4.3/10. Published 2018-09-13.

How severe is CVE-2018-8425?

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

Vulnerability in Microsoft Edge

CVE-2018-8425

A spoofing vulnerability exists when Microsoft Edge improperly handles specific HTML content, aka "Microsoft Edge Spoofing Vulnerability." This affects Microsoft Edge.

Published 2018-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.035 (88.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000

Affected products

Microsoft Edge
Microsoft Edge — versions Windows 10 for 32-bit Systems, Windows 10 for x64-based Systems, Windows 10 Version 1607 for 32-bit Systems
Microsoft Windows 10 — versions 1607, 1703, 1709
Microsoft Windows Server 2016

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8425 (Patch, Vendor Advisory)
www.securityfocus.com/bid/105255 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1041623 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-8425?: CVE-2018-8425 is a medium-severity vulnerability in Microsoft Edge, classified under Authentication Bypass by Spoofing. CVSS score: 4.3/10. Published 2018-09-13.
How severe is CVE-2018-8425?: Medium severity. CVSS v3 base score is 4.3 out of 10.