CVE-2022-29916

Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables

Medium · published December 22, 2022

CVSS v3.1
6.5
EPSS
1%
Percentile
54.7
In the wild
Unconfirmed
What it is

Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables. This could have been used to probe the browser history. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00758 · 54.7th percentile
Published
2022-12-22T00:00Z
EPSS history
Timeline
  • 22 DEC 00:00Z
    Firefox behaved slightly differently for already known resources when loading CSS resources involving CSS variables
    cvelistv5