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CVE-2021-43540

Published: 8 December 2021

WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.

Priority

Medium

CVSS 3 base score: 6.5

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
bionic
Released (95.0+build1-0ubuntu0.18.04.1)
focal
Released (95.0+build1-0ubuntu0.20.04.1)
hirsute
Released (95.0+build1-0ubuntu0.21.04.1)
impish
Released (95.0+build1-0ubuntu0.21.10.1)
jammy
Released (95.0+build1-0ubuntu1)
trusty Does not exist

upstream
Released (95)
xenial Needed