CVE-2015-4478

Status: ModifiedMedium (5)—
Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 do not impose certain ECMAScript 6 requirements on JavaScript object properties, which allows remote attackers to bypass the Same Origin Policy via the reviver parameter to the JSON.parse method.
CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
Base score: 5
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 3.37%
Percentile among all scored CVEs: 88
Score date: 10/11/2026
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 (3)

Canonical — Ubuntu Linux Mozilla — Firefox Opensuse — Opensuse
CWEs

CWE-200
References

Raw JSON (NVD)

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{
  "id": "CVE-2015-4478",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
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        }
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    }
  ],
  "published": "2015-08-16T01:59:05.677",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html",
      "source": "security@mozilla.org"
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    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html",
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      "url": "http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html",
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    {
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      "source": "security@mozilla.org"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "description": [
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          "value": "CWE-200"
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    {
      "lang": "en",
      "value": "Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 do not impose certain ECMAScript 6 requirements on JavaScript object properties, which allows remote attackers to bypass the Same Origin Policy via the reviver parameter to the JSON.parse method."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad en Mozilla Firefox en versiones anteriores a 40.0 y Firefox ESR 38.x en versiones anteriores a 38.2, no impone ciertos requerimientos ECMAScript 6 sobre las propiedades del objeto de JavaScript, lo que permite a atacantes remotos evadir la Same Origin Policy a través de un parámetro reviver del método JSON.parse."
    }
  ],
  "lastModified": "2026-06-17T00:27:21.360",
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