CVE-2022-29916
Mozilla: Leaking browser history with CSS variables
Severity
ImportantRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · May 3, 2022
Updated · November 21, 2025
Description
A flaw was found in Mozilla. The Mozilla Foundation Security Advisory describes the issue of Firefox behaving slightly differently for already known resources when loading CSS resources involving CSS variables. This flaw could probe the browser history.
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-497 · Exposure of Sensitive System Information to an Unauthorized Control Sphere