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CVE-2018-12369

Status: ModifiedCritical (9.8)—

WebExtensions bundled with embedded experiments were not correctly checked for proper authorization. This allowed a malicious WebExtension to gain full browser permissions. This vulnerability affects Firefox ESR < 60.1 and Firefox < 61.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Canonical — Ubuntu LinuxMozilla — Firefox

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2018-12369",
  "cveTags": [],
  "metrics": {
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 3.9
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  "affected": [
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      "affectedData": [
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          "versions": [
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  "published": "2018-10-18T13:29:03.663",
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      "source": "security@mozilla.org"
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-863"
        }
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    }
  ],
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    {
      "lang": "en",
      "value": "WebExtensions bundled with embedded experiments were not correctly checked for proper authorization. This allowed a malicious WebExtension to gain full browser permissions. This vulnerability affects Firefox ESR < 60.1 and Firefox < 61."
    },
    {
      "lang": "es",
      "value": "Las WebExtensions incluidas con los experimentos embebidos no se comprobaron correctamente en busca de una autorización adecuada. Esto permitía que una WebExtension maliciosa obtenga los permisos totales del navegador. La vulnerabilidad afecta a Firefox ESR en versiones anteriores a la 60.1 y Firefox en versiones anteriores a la 61."
    }
  ],
  "lastModified": "2026-06-17T01:37:38.347",
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