{"schema_version":"1.7.5","id":"CVE-2020-26978","published":"2021-01-07T14:15:12.297Z","modified":"2026-04-16T04:30:41.029077110Z","related":["SUSE-SU-2020:14584-1","SUSE-SU-2020:3900-1","SUSE-SU-2020:3901-1","SUSE-SU-2020:3902-1","SUSE-SU-2020:3903-1","SUSE-SU-2020:3935-1","openSUSE-SU-2020:2317-1","openSUSE-SU-2020:2318-1","openSUSE-SU-2020:2324-1","openSUSE-SU-2020:2325-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"details":"Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.","affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26978.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"84.0"}]},{"events":[{"introduced":"0"},{"fixed":"78.6.0"}]},{"events":[{"introduced":"0"},{"fixed":"78.6.0"}]}]}}],"references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-54/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-55/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-56/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1677047"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}