{"action":"Upgrade thunderbird to 91.5.0-r0 or later.","affected":[{"fixed":"91.5.0-r0","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.21","exploited":false,"fixed_versions":["91.5.0-r0"],"id":"tcs_01M6GZ1159SD8RG9B67SFBW0MV","modified_at":"2026-11-03T06:32:47.838658231Z","published_at":"2022-12-22T20:15:12.250Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2021-4140","https://security.alpinelinux.org/vuln/CVE-2021-4140"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2021-4140#Alpine:v3.21/thunderbird","url":"https://osv.dev/vulnerability/ALPINE-CVE-2021-4140"}],"summary":"It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5."}