{"id":"CVE-2026-118177","aliases":[],"title":"Calendar discovery accepted local file and remote network share locations","titleSource":"mozilla","descriptionSource":"mozilla","products":[{"vendor":"Mozilla","name":"Thunderbird","platforms":[],"versions":[{"version":"153.6","status":"unaffected","lessThanOrEqual":"153.*","versionType":"rpm"},{"version":"159","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}],"source":"mozilla","url":"https://www.cve.org/CVERecord?id=CVE-2026-118177"}],"remediation":[],"description":"When looking for calendars in a directory on a server, during account setup or when adding a new network calendar, Thunderbird accepted calendar locations pointing to other servers, local files or network shares. A malicious server, or a network attacker when the lookup used plain HTTP, could make Thunderbird subscribe to such a location. On Windows this could leak the user's NTLM credentials to an attacker-controlled host on every calendar refresh, and changes to the calendar could be written to the attacker's share or overwrite a local file. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.","severity":"unknown","score":null,"published":"2026-10-27T18:16:31.083Z","modified":"2026-10-27T18:27:49.964Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2080924","https://www.mozilla.org/security/advisories/mfsa2026-121/","https://www.mozilla.org/security/advisories/mfsa2026-122/"],"sources":[{"name":"CVE","id":"CVE-2026-118177","modified":"2026-10-27T18:27:49.964Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-118177"}],"assessments":[],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T00:55:32.564Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}