FKIE_CVE-2025-3522

Vulnerability from fkie_nvd - Published: 2025-04-15 15:16 - Updated: 2025-06-18 13:26
Severity ?
6.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Summary
Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1955372Permissions Required
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-26/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-27/Vendor Advisory
Impacted products
Vendor Product Version
mozilla thunderbird *
mozilla thunderbird *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D11A3908-71D7-4967-8029-0D4DD57F384C",
              "versionEndExcluding": "128.9.2",
              "vulnerable": true
            },
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to  determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird \u003c 137.0.2 and Thunderbird \u003c 128.9.2."
    },
    {
      "lang": "es",
      "value": "Thunderbird procesa el encabezado X-Mozilla-External-Attachment-URL para gestionar los archivos adjuntos alojados externamente. Al abrir un correo electr\u00f3nico, Thunderbird accede a la URL especificada para determinar el tama\u00f1o del archivo y la accede cuando el usuario hace clic en el archivo adjunto. Dado que la URL no est\u00e1 validada ni depurada, puede hacer referencia a recursos internos como enlaces a chrome:// o a recursos compartidos SMB file://, lo que podr\u00eda provocar una fuga de credenciales de Windows con hash y dar lugar a problemas de seguridad m\u00e1s graves. Esta vulnerabilidad afecta a Thunderbird (versi\u00f3n anterior a la 137.0.2) y Thunderbird (versi\u00f3n anterior a la 128.9.2)."
    }
  ],
  "id": "CVE-2025-3522",
  "lastModified": "2025-06-18T13:26:04.983",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L",
          "version": "3.1"
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        "impactScore": 3.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-04-15T15:16:09.877",
  "references": [
    {
      "source": "security@mozilla.org",
      "tags": [
        "Permissions Required"
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1955372"
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      "source": "security@mozilla.org",
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      "url": "https://www.mozilla.org/security/advisories/mfsa2025-27/"
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  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "CWE-601"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
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