{"id":"CVE-2026-113866","state":"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.","publishedAt":"2026-10-20T19:14:54.646Z","updatedAt":"2026-10-20T19:46:38.284Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"mozilla","products":["Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.5.1","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158.0.1","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2080121","https://www.mozilla.org/security/advisories/mfsa2026-114/","https://www.mozilla.org/security/advisories/mfsa2026-115/"],"weaknesses":["CWE-523"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/113xxx/CVE-2026-113866.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-113866","state":"PUBLISHED","datePublished":"2026-10-20T19:14:54.646Z","dateUpdated":"2026-10-20T19:46:38.284Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2026-10-20T19:14:54.467Z"},"containers":{"cna":{"title":"Account password sent unencrypted during Exchange account setup","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.5.1","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"158.0.1","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}]}],"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/"}],"providerMetadata":{"shortName":"mozilla","orgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateUpdated":"2026-10-20T19:46:38.284Z"},"credits":[{"lang":"en","value":"Magnus Melin"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.9,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-20T19:35:34.601906Z","id":"CVE-2026-113866","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-523","type":"CWE","lang":"en","description":"CWE-523 Unprotected Transport of Credentials"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-20T19:35:37.854Z"}}]}}}