CVE-2022-40959
Mozilla: Bypassing FeaturePolicy restrictions on transient pages
Severity
ImportantRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · September 20, 2022
Updated · November 21, 2025
Description
A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue that certain pages did not have their FeaturePolicy fully initialized during iframe navigation, leading to a bypass that leaked device permissions into untrusted subdocuments.
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 · 7.5CVSS: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