{"id":"CVE-2026-113866","title":"Account password sent unencrypted during Exchange account setup","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 the user had entered, allowing a netwo…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"adp","vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-20T19:35:34.601906Z"},"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T19:46:38.284Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113866","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2080121"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-114/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-115/"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T20:18:14.530Z","slug":"CVE-2026-113866","body":"## Overview\n\nWhen 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.\n\n## Affected\n\n- `Thunderbird`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}