{"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_01M5NQB354XB5E953PCRH3DWKE","modified_at":"2026-10-26T20:00:15.742041363Z","published_at":"2026-10-20T20:17:19.687Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2026-113868","https://security-tracker.debian.org/tracker/CVE-2026-113868"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2026-113868#Debian:13/thunderbird","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2026-113868"}],"summary":"When authenticating to a POP3 or SMTP server using NTLM, Thunderbird did not check whether the server's challenge was valid base64. A malicious server could send a challenge that caused Thunderbird to"}