What is CVE-2018-18496?

CVE-2018-18496 is a high-severity vulnerability in Microsoft Windows, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 8.8/10. Published 2019-02-28.

How severe is CVE-2018-18496?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Microsoft Windows

CVE-2018-18496

When the RSS Feed preview about:feeds page is framed within another page, it can be used in concert with scripted content for a clickjacking attack that confuses users into downloading and executing an executable file from a temporary directory. *Note: This issue only affects Windows operating systems. Other operating systems are not affected.*. This vulnerability affects Firefox < 64.

Published 2019-02-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Microsoft Windows
Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

References

www.mozilla.org/security/advisories/mfsa2018-29/ (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Vendor Advisory, Permissions Required, Issue Tracking)
www.securityfocus.com/bid/106167 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-18496?: CVE-2018-18496 is a high-severity vulnerability in Microsoft Windows, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 8.8/10. Published 2019-02-28.
How severe is CVE-2018-18496?: High severity. CVSS v3 base score is 8.8 out of 10.