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CVE-2018-18495

Estado: ModificadaMedia (6.5)—

Se pueden cargar los scripts del contenido de WebExtensions en páginas about:, en algunas circunstancias, en violación de los permisos otorgados a las extensiones. Esto podría permitir a una extensión interferir con la carga y el uso de estas páginas y utilizar capacidades que deberían estar restringidas para extensiones. Esta vulnerabilidad afecta a las versiones anteriores a la 64 de Firefox.

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)

Canonical — Ubuntu LinuxMozilla — Firefox

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2018-18495",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "64",
              "versionType": "custom"
            }
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  "published": "2019-02-28T18:29:01.680",
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      "url": "http://www.securityfocus.com/bid/106167",
      "tags": [
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      "source": "security@mozilla.org"
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      "tags": [
        "Issue Tracking",
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        "Vendor Advisory"
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      "source": "security@mozilla.org"
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      "tags": [
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      "source": "security@mozilla.org"
    },
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      "url": "https://www.mozilla.org/security/advisories/mfsa2018-29/",
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      "source": "security@mozilla.org"
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    {
      "url": "http://www.securityfocus.com/bid/106167",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-732"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the permissions granted to extensions. This could allow an extension to interfere with the loading and usage of these pages and use capabilities that were intended to be restricted from extensions. This vulnerability affects Firefox < 64."
    },
    {
      "lang": "es",
      "value": "Se pueden cargar los scripts del contenido de WebExtensions en páginas about:, en algunas circunstancias, en violación de los permisos otorgados a las extensiones. Esto podría permitir a una extensión interferir con la carga y el uso de estas páginas y utilizar capacidades que deberían estar restringidas para extensiones. Esta vulnerabilidad afecta a las versiones anteriores a la 64 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:47:23.973",
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