CVE-2022-34479

Mozilla: A popup window could be resized in a way to overlay the address bar with web content

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · June 28, 2022

Updated · November 21, 2025

Description

A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of a malicious website that creates a popup that could have resized the popup to overlay the address bar with its own content, resulting in potential user confusion or spoofing attacks.

Statement

This bug only affects Firefox and Thunderbird for Linux. Other operating systems are unaffected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-1021 · Improper Restriction of Rendered UI Layers or Frames