{"action":"Upgrade thunderbird to 1:78.6.0-1 or later.","affected":[{"fixed":"1:78.6.0-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:78.6.0-1"],"id":"tcs_01M5NEXSCB9NBVPABASS0MC94C","modified_at":"2026-09-11T11:02:31.394352649Z","published_at":"2021-01-07T14:15:11.893Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-26973","https://security-tracker.debian.org/tracker/CVE-2020-26973"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-26973#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-26973"}],"summary":"Certain input to the CSS Sanitizer confused it, resulting in incorrect components being removed. This could have been used as a sanitizer bypass. This vulnerability affects Firefox < 84, Thunderbird <"}