{"action":"Upgrade thunderbird to 1:153.4.0esr-1 or later.","affected":[{"fixed":"1:153.4.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:153.4.0esr-1"],"id":"tcs_01M5NPHQZNETF67BBSY773CEYX","modified_at":"2026-10-06T16:02:07.337067384Z","published_at":"2026-09-29T13:17:46.023Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100809","https://security-tracker.debian.org/tracker/CVE-2026-100809"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100809#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100809"}],"summary":"Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157."}