{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-126133","sourceIdentifier":"security@mozilla.org","published":"2026-11-10T19:21:13.983","lastModified":"2026-11-10T21:19:27.670","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"When a CalDAV or ICS calendar was accessed through an HTTP proxy that requested authentication, Thunderbird could answer the proxy with the calendar server's username and password. This affected both setting up a new calendar and syncing existing calendars, where a saved password could be sent without any user interaction. A malicious or compromised proxy could use this to obtain the calendar credentials, even for calendars served over HTTPS. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7."}],"affected":[{"source":"security@mozilla.org","affectedData":[{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"153.7","lessThanOrEqual":"153.*","versionType":"rpm","status":"unaffected"},{"version":"160","lessThanOrEqual":"*","versionType":"rpm","status":"unaffected"}]}]}],"metrics":{},"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2083485","source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-128/","source":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-129/","source":"security@mozilla.org"}]}}