{"action":"Upgrade thunderbird to 1:153.5.1esr-1~deb13u1 or later.","affected":[{"fixed":"1:153.5.1esr-1~deb13u1","introduced":"0"}],"component":"thunderbird","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["1:153.5.1esr-1~deb13u1"],"id":"tcs_01M5NQB2J5YJZBMGB04CNGFFQS","modified_at":"2026-10-26T20:00:15.618303287Z","published_at":"2026-10-20T20:17:19.397Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-113866","https://security-tracker.debian.org/tracker/CVE-2026-113866"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-113866#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-113866"}],"summary":"When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials t"}