{"action":"Upgrade thunderbird to 1:128.10.1esr-1 or later.","affected":[{"fixed":"1:128.10.1esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1:128.10.1esr-1"],"id":"tcs_01M5NNMWHZ6W04X7JHF5E3GSX2","modified_at":"2026-09-01T20:05:49.908629944Z","published_at":"2025-05-14T17:15:48.660Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2025-3909","https://security-tracker.debian.org/tracker/CVE-2025-3909"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2025-3909#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2025-3909"}],"summary":"Thunderbird's handling of the X-Mozilla-External-Attachment-URL header can be exploited to execute JavaScript in the file:/// context. By crafting a nested email attachment (message/rfc822) and settin"}