{"action":"Upgrade thunderbird to 1:140.14.0esr-1 or later.","affected":[{"fixed":"1:140.14.0esr-1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1:140.14.0esr-1"],"id":"tcs_01M5NVBR6K7C3BQQS57PGF3KFW","modified_at":"2026-10-01T03:03:41.957317368Z","published_at":"2026-08-18T13:17:33.560Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-74963","https://security-tracker.debian.org/tracker/CVE-2026-74963"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-74963#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-74963"}],"summary":"Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird"}