{"id":"CVE-2021-43540","details":"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affects Firefox \u003c 95.","modified":"2026-05-04T08:31:03.903683Z","published":"2021-12-08T22:15:09.787Z","withdrawn":"2026-05-04T08:31:03.903683Z","related":["openSUSE-SU-2024:11669-1","openSUSE-SU-2024:14572-1"],"references":[{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202202-03"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2021-52/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1636629"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"95.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43540.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}