{"affected":[{"product":"Thunderbird","source":"CNA: mozilla","vendor":"Mozilla","versions":[{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.6","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"159","versionType":"rpm"}]}],"cveId":"CVE-2026-118174","cwes":["CWE-829"],"description":"When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment's content to offer importing the key. A sender could mark the attachment as an external attachment pointing to an arbitrary URL, which Thunderbird then loaded without any user interaction, bypassing remote content blocking. On Windows, a URL pointing to an attacker-controlled network share could leak the user's NTLM credentials.\nThe NTLM credential leak only affects Thunderbird on Windows. On other operating systems, the issue allowed a remote request that bypassed remote content blocking. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.","epss":{"date":"2026-11-04","percentile":0.0882,"score":0.0019},"exploits":[],"kev":null,"metrics":[{"score":6.5,"severity":"medium","source":"ADP: CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},{"score":6.5,"severity":"medium","source":"NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"}],"modifiedAt":1793812653447,"publishedAt":1793124988729,"references":[{"source":"CNA: mozilla","tags":[],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2080910"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"},{"source":"security@mozilla.org","tags":[],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2080910"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"}],"remediation":[],"revision":"0c75c90f0d360532319b75685c93c5f6b1c4dc611238a2b8e5ec3844a13d6030","sources":[{"modifiedAt":1793811049173,"name":"CNA: mozilla","retrievedAt":1793812175490,"url":"https://www.cve.org/CVERecord?id=CVE-2026-118174"},{"modifiedAt":1793812653447,"name":"NVD","retrievedAt":1793816559195,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118174"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793812191410,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-118174"}],"ssvc":{"assessedAt":1793811013466,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Displaying a message could load an attacker-chosen URL through an OpenPGP key attachment","updatedAt":1793816559195}