{"id":"CVE-2026-118174","title":"Displaying a message could load an attacker-chosen URL through an OpenPGP key attachment","summary":"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 arbitrar…","severity":"none","vendor":"Mozilla","product":"Thunderbird","affected":["Thunderbird"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T18:27:46.521Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-118174","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2080910"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T18:52:10.023Z","slug":"CVE-2026-118174","body":"## Overview\n\nWhen 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.\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":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}