{"id":"CVE-2026-113866","aliases":["DEBIAN-CVE-2026-113866","EUVD-2026-105293","GHSA-6c7w-fhrm-qhj3","UBUNTU-CVE-2026-113866","openSUSE-SU-2026:12224-1"],"status":"published","title":"Account password sent unencrypted during Exchange account setup","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.00365,"percentile":0.30735,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-523"],"published":"2026-10-20T19:14:54Z","modified":"2026-10-28T20:17:44Z","fixes":[{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:153.5.1esr-1~deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:153.5.1esr-1~deb13u1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:153.5.1esr-1~deb12u1"}]}],"versions":["1:102.11.0-1","1:102.12.0-1","1:102.12.0-1~deb10u1","1:102.12.0-1~deb11u1","1:102.12.0-1~deb12u1","1:102.13.0-1","1:102.13.0-1~deb10u1","1:102.13.0-1~deb11u1","1:102.13.0-1~deb12u1","1:102.13.1-1","1:102.13.1-1~deb10u1","1:102.13.1-1~deb11u1","1:102.13.1-1~deb12u1","1:102.14.0-1~deb10u1","1:102.14.0-1~deb11u1","1:102.14.0-1~deb12u1","1:102.15.0-1~deb10u1","1:102.15.0-1~deb11u1","1:102.15.0-1~deb12u1","1:102.15.1-1~deb10u1","1:102.15.1-1~deb11u1","1:102.15.1-1~deb12u1","1:103.0~b5-1","1:104.0~b2-1","1:110.0~b4-1","1:112.0~b1-1","1:113.0~b3-1","1:114.0~b2-1","1:115.0-1","1:115.0.1-1","1:115.0.1-2","1:115.0~b4-1","1:115.0~b6-1","1:115.1.0-1","1:115.1.1-1","1:115.10.1-1","1:115.10.1-1~deb10u1","1:115.10.1-1~deb11u1","1:115.10.1-1~deb12u1","1:115.11.0-1","1:115.11.0-1~deb10u1","1:115.11.0-1~deb11u1","1:115.11.0-1~deb12u1","1:115.12.0-1","1:115.12.0-1~deb10u1","1:115.12.0-1~deb11u1","1:115.12.0-1~deb12u1","1:115.13.0-1","1:115.13.0-1~deb11u1","1:115.13.0-1~deb12u1","1:115.14.0-1~deb11u1","1:115.14.0-1~deb12u1","1:115.15.0-1~deb11u1","1:115.15.0-1~deb12u1","1:115.16.0esr-1~deb11u1","1:115.16.0esr-1~deb12u1","1:115.2.0-1","1:115.2.2-1","1:115.3.0-1","1:115.3.0-1~deb12u1","1:115.3.1-1","1:115.3.1-1~deb10u1","1:115.3.1-1~deb11u1","1:115.3.1-1~deb12u1","1:115.4.1-1","1:115.4.1-1~deb10u1","1:115.4.1-1~deb11u1","1:115.4.1-1~deb12u1","1:115.5.0-1","1:115.5.0-1~deb10u1","1:115.5.0-1~deb11u1","1:115.5.0-1~deb12u1","1:115.5.1-1","1:115.5.2-1","1:115.6.0-1","1:115.6.0-1~deb10u1","1:115.6.0-1~deb11u1","1:115.6.0-1~deb12u1","1:115.7.0-1","1:115.7.0-1~deb10u1","1:115.7.0-1~deb11u1","1:115.7.0-1~deb12u1","1:115.8.0-1","1:115.8.0-1~deb10u1","1:115.8.0-1~deb11u1","1:115.8.0-1~deb12u1","1:115.8.1-1","1:115.9.0-1","1:115.9.0-1~deb10u1","1:115.9.0-1~deb11u1","1:115.9.0-1~deb12u1","1:116.0~b7-1","1:117.0~b5-1","1:120.0~b1-1","1:121.0~b3-1","1:122.0~b2-1","1:124.0~b5-1","1:125.0~b3-1","1:127.0~b5-1","1:128.0esr-1","1:128.0~b5-1","1:128.1.0esr-1","1:128.1.1esr-1","1:128.10.0esr-1","1:128.10.0esr-1~deb11u1","1:128.10.0esr-1~deb12u1","1:128.10.1esr-1","1:128.10.1esr-1~deb11u1","1:128.10.1esr-1~deb12u1","1:128.11.0esr-1","1:128.11.0esr-1~deb11u1","1:128.11.0esr-1~deb12u1","1:128.12.0esr-1","1:128.12.0esr-1~deb11u1","1:128.12.0esr-1~deb12u1","1:128.13.0esr-1","1:128.13.0esr-1~deb11u1","1:128.13.0esr-1~deb12u1","1:128.14.0esr-1","1:128.14.0esr-1~deb11u1","1:128.14.0esr-1~deb12u1","1:128.14.0esr-1~deb13u1","1:128.2.0esr-1","1:128.2.1esr-1","1:128.2.3esr-1","1:128.3.0esr-1","1:128.3.2esr-1","1:128.4.0esr-1","1:128.4.0esr-1~deb11u1","1:128.4.0esr-1~deb12u1","1:128.4.2esr-1","1:128.4.3esr-1","1:128.4.3esr-1~deb11u1","1:128.4.3esr-1~deb12u1","1:128.5.0esr-1","1:128.5.0esr-1~deb11u1","1:128.5.0esr-1~deb12u1","1:128.5.2esr-1","1:128.6.0esr-1","1:128.6.0esr-1~deb11u1","1:128.6.0esr-1~deb12u1","1:128.7.0esr-1","1:128.7.0esr-1~deb11u1","1:128.7.0esr-1~deb12u1","1:128.8.0esr-1","1:128.8.0esr-1~deb11u1","1:128.8.0esr-1~deb12u1","1:128.9.0esr-1","1:128.9.0esr-1~deb11u1","1:128.9.0esr-1~deb12u1","1:129.0~b6-1","1:130.0~b3-1","1:132.0~b6-1","1:135.0-1","1:136.0-1","1:137.0-1","1:138.0-1","1:140.0.1esr-1","1:140.1.0esr-1","1:140.1.1esr-1","1:140.10.0esr-1","1:140.10.0esr-1~deb11u1","1:140.10.0esr-1~deb12u1","1:140.10.0esr-1~deb13u1","1:140.10.1esr-1","1:140.10.1esr-1~deb11u1","1:140.10.1esr-1~deb12u1","1:140.10.1esr-1~deb13u1","1:140.10.2esr-1","1:140.10.2esr-1~deb11u1","1:140.10.2esr-1~deb12u1","1:140.10.2esr-1~deb13u1","1:140.11.0esr-1","1:140.11.0esr-1~deb11u1","1:140.11.0esr-1~deb12u1","1:140.11.0esr-1~deb13u1","1:140.12.0esr-1","1:140.12.0esr-1~deb11u1","1:140.12.0esr-1~deb12u1","1:140.12.0esr-1~deb13u1","1:140.13.0esr-1","1:140.13.0esr-2","1:140.13.0esr-2~deb11u1","1:140.13.0esr-2~deb12u1","1:140.13.0esr-2~deb13u1","1:140.14.0esr-1","1:140.14.0esr-1~deb11u1","1:140.14.0esr-1~deb12u1","1:140.14.0esr-1~deb13u1","1:140.15.0esr-1~deb12u1","1:140.15.0esr-1~deb13u1","1:140.16.0esr-1~deb12u1","1:140.16.0esr-1~deb13u1","1:140.17.0esr-1~deb12u1","1:140.17.0esr-1~deb13u1","1:140.2.0esr-1","1:140.3.0esr-1","1:140.3.0esr-1~deb11u1","1:140.3.0esr-1~deb12u1","1:140.3.0esr-1~deb13u1","1:140.3.1esr-1","1:140.4.0esr-1","1:140.4.0esr-1~deb11u1","1:140.4.0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Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T19:14:54.646Z","modified":"2026-10-20T19:46:38.284Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-523"],"updated_at":"2026-11-02T13:44:29.519518Z"}],"euvd":[{"id":"EUVD-2026-105293","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T19:14:54Z","modified":"2026-10-20T19:46:38Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:42.590373Z"}],"ghsa":[{"id":"GHSA-6c7w-fhrm-qhj3","title":"When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's...","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T21:31:02Z","modified":"2026-10-20T21:31:10Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-523"],"updated_at":"2026-11-02T15:14:04.750771Z"}],"nvd":[{"id":"CVE-2026-113866","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T20:17:19.397Z","modified":"2026-10-22T17:36:46.95Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-523"],"updated_at":"2026-11-02T14:13:01.161484Z"}],"osv":[{"id":"DEBIAN-CVE-2026-113866","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T20:17:19.397Z","modified":"2026-10-26T20:00:15.618303287Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:50.923612Z"},{"id":"UBUNTU-CVE-2026-113866","description":"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 the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.","status":"published","published":"2026-10-20T20:17:00Z","modified":"2026-10-28T20:17:44.882589302Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:55:59.591851Z"},{"id":"openSUSE-SU-2026:12224-1","title":"MozillaThunderbird-153.5.1-1.1 on GA media","description":"These are all security issues fixed in the MozillaThunderbird-153.5.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-22T00:00:00Z","modified":"2026-10-23T17:23:11.557727532Z","updated_at":"2026-11-02T16:58:40.245664Z"}]}}