{"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_01M5NPHXSW8F870DRSDR3PKCC0","modified_at":"2026-10-14T09:47:44.966365779Z","published_at":"2026-09-29T13:17:47.400Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-100821","https://security-tracker.debian.org/tracker/CVE-2026-100821"],"severity":{"label":"medium","score":4.7},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-100821#Debian:14/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-100821"}],"summary":"Site isolation issue in the Panning and Zooming component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, a"}