Description
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
Scores
CVSS v3
5.4
EPSS
0.0003
EPSS Percentile
8.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-288
Status
published
Products (4)
mozilla/firefox
< 143.0
Mozilla/Firefox
143
mozilla/thunderbird
< 143.0
Mozilla/Thunderbird
143
Published
Sep 16, 2025
Tracked Since
Feb 18, 2026