{"id":"CVE-2021-43531","details":"When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox \u003c 94.","modified":"2026-05-04T08:31:03.691782Z","published":"2021-12-08T22:15:09.310Z","withdrawn":"2026-05-04T08:31:03.691782Z","references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2021-48/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1659155"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"94.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43531.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:L/I:N/A:N"}]}