What is CVE-2026-20942?

CVE-2026-20942 is a medium-severity vulnerability in Microsoft Edge (Chromium-Based), classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.3/10. Published 2026-10-29.

How severe is CVE-2026-20942?

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

Vulnerability in Microsoft Edge (Chromium-Based)

CVE-2026-20942

Improper restriction of rendered ui layers or frames in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Published 2026-10-29 · last modified 2026-10-29.

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:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Microsoft Edge (Chromium-Based)

Weakness classification (CWE)

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20942 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-20942?: CVE-2026-20942 is a medium-severity vulnerability in Microsoft Edge (Chromium-Based), classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 4.3/10. Published 2026-10-29.
How severe is CVE-2026-20942?: Medium severity. CVSS v3 base score is 4.3 out of 10.