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CVE-2025-11712

Estado: ModificadaMedia (6.1)—

A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Mozilla — FirefoxMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-11712",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-11712",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-10-15T13:21:51.563465Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "unaffected",
              "version": "140.4",
              "versionType": "rpm",
              "lessThanOrEqual": "140.*"
            },
            {
              "status": "unaffected",
              "version": "144",
              "versionType": "rpm",
              "lessThanOrEqual": "*"
            }
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        {
          "vendor": "Mozilla",
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              "status": "unaffected",
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  "published": "2025-10-14T13:15:37.447",
  "references": [
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1979536",
      "tags": [
        "Issue Tracking",
        "Permissions Required"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-81/",
      "tags": [
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-83/",
      "tags": [
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-84/",
      "tags": [
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2025-85/",
      "tags": [
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-116"
        }
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4."
    }
  ],
  "lastModified": "2026-06-17T08:31:02.523",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "563626A1-A62C-4F33-A40F-31AC364254E1",
              "versionEndExcluding": "140.4.0"
            },
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              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*",
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              "matchCriteriaId": "CEE2F6DA-4331-4D6D-B01B-610DFDBE1833",
              "versionEndExcluding": "144.0"
            },
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              "vulnerable": true,
              "matchCriteriaId": "7C6D96D2-1E0E-4A18-B8B1-21F67E1AB441",
              "versionEndExcluding": "140.4.0"
            },
            {
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              "vulnerable": true,
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              "versionEndExcluding": "144.0",
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            }
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          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security@mozilla.org"
}