CVE-2026-126134 (GCVE-0-2026-126134)

Vulnerability from cvelistv5 – Published: 2026-11-10 18:59 – Updated: 2026-11-10 20:24
VLAI
Title
Feed subscriptions could leak NTLM credentials on Windows
Summary
Thunderbird allowed feed subscriptions to file: URLs that point to a network share. If a user was tricked into subscribing to such a URL, Thunderbird connected to the attacker's server when fetching the feed. Windows then sent the user's NTLM credentials to that server. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7.
Severity
No CVSS data available.
Assigner
mozilla CNA
References
Impacted products
Vendor Product Version
Mozilla Thunderbird Unaffected: 153.7 , ≤ 153.* (rpm)
Unaffected: 160 , ≤ * (rpm)
Create a notification for this product.
Credits
Magnus Melin
Show details on NVD website
To clipboard 

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  "containers": {
    "cna": {
      "affected": [
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "153.*",
              "status": "unaffected",
              "version": "153.7",
              "versionType": "rpm"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "160",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Magnus Melin"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Thunderbird allowed feed subscriptions to file: URLs that point to a network share. If a user was tricked into subscribing to such a URL, Thunderbird connected to the attacker\u0027s server when fetching the feed. Windows then sent the user\u0027s NTLM credentials to that server.\u003cbr /\u003eThis bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7."
            }
          ],
          "value": "Thunderbird allowed feed subscriptions to file: URLs that point to a network share. If a user was tricked into subscribing to such a URL, Thunderbird connected to the attacker\u0027s server when fetching the feed. Windows then sent the user\u0027s NTLM credentials to that server.\nThis bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T20:24:07.490Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2083584"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-128/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-129/"
        }
      ],
      "title": "Feed subscriptions could leak NTLM credentials on Windows"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-126134",
    "datePublished": "2026-11-10T18:59:55.697Z",
    "dateReserved": "2026-11-10T18:59:55.076Z",
    "dateUpdated": "2026-11-10T20:24:07.490Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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