CVE-2026-118174 (GCVE-0-2026-118174)
Vulnerability from cvelistv5
Published
2026-10-27 18:16
Modified
2026-10-27 18:27
Severity ?
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 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. The 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.
References
Impacted products
Vendor Product Version
Mozilla Thunderbird Unaffected: 153.6
Unaffected: 159
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.6",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "159",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Magnus Melin"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment\u0027s 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\u0027s NTLM credentials.\u003cbr /\u003eThe 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."
            }
          ],
          "value": "When a message containing an OpenPGP key attachment was displayed, Thunderbird automatically loaded the attachment\u0027s 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\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T18:27:46.521Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "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/"
        }
      ],
      "title": "Displaying a message could load an attacker-chosen URL through an OpenPGP key attachment"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-118174",
    "datePublished": "2026-10-27T18:16:28.729Z",
    "dateReserved": "2026-10-27T18:16:28.266Z",
    "dateUpdated": "2026-10-27T18:27:46.521Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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