CVE-2026-126132 (GCVE-0-2026-126132)

Vulnerability from cvelistv5 – Published: 2026-11-10 18:59 – Updated: 2026-11-10 20:24
VLAI
Title
Attachments could be replaced with local file content when forwarding
Summary
When a message was forwarded inline, edited as new, or had an attachment dragged into a compose window, a specially crafted link attachment (a .desktop file on Linux, or a .url or .lnk file on Windows) was replaced with the content of the file or URL it pointed to when the message was saved or sent. This could disclose local files, or content from the user's network, to the message recipients or to the mail provider. This bug only affects Thunderbird on Linux and 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
Christopher Bohn (Protectstar Inc.)
Show details on NVD website
To clipboard 

{
  "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": "Christopher Bohn (Protectstar Inc.)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "When a message was forwarded inline, edited as new, or had an attachment dragged into a compose window, a specially crafted link attachment (a .desktop file on Linux, or a .url or .lnk file on Windows) was replaced with the content of the file or URL it pointed to when the message was saved or sent. This could disclose local files, or content from the user\u0027s network, to the message recipients or to the mail provider.\u003cbr /\u003eThis bug only affects Thunderbird on Linux and Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7."
            }
          ],
          "value": "When a message was forwarded inline, edited as new, or had an attachment dragged into a compose window, a specially crafted link attachment (a .desktop file on Linux, or a .url or .lnk file on Windows) was replaced with the content of the file or URL it pointed to when the message was saved or sent. This could disclose local files, or content from the user\u0027s network, to the message recipients or to the mail provider.\nThis bug only affects Thunderbird on Linux and Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160 and Thunderbird 153.7."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T20:24:06.460Z",
        "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "shortName": "mozilla"
      },
      "references": [
        {
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2081919"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-128/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-129/"
        }
      ],
      "title": "Attachments could be replaced with local file content when forwarding"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-126132",
    "datePublished": "2026-11-10T18:59:53.143Z",
    "dateReserved": "2026-11-10T18:59:52.486Z",
    "dateUpdated": "2026-11-10T20:24:06.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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