CVE-2015-7188

Status: ModifiedHigh (7.5)—
Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 allow remote attackers to bypass the Same Origin Policy for an IP address origin, and conduct cross-site scripting (XSS) attacks, by appending whitespace characters to an IP address string.
CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Base score: 7.5
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 3.10%
Percentile among all scored CVEs: 87
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 (1)

Mozilla — Firefox
CWEs

CWE-254
References

Raw JSON (NVD)

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{
  "id": "CVE-2015-7188",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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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"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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      "affectedData": [
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          "product": "n/a",
          "versions": [
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              "version": "n/a"
            }
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    }
  ],
  "published": "2015-11-05T05:59:12.073",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00013.html",
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    {
      "url": "https://security.gentoo.org/glsa/201512-10",
      "source": "security@mozilla.org"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-254"
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      "lang": "en",
      "value": "Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 allow remote attackers to bypass the Same Origin Policy for an IP address origin, and conduct cross-site scripting (XSS) attacks, by appending whitespace characters to an IP address string."
    },
    {
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      "value": "Mozilla Firefox en versiones anteriores a 42.0 y Firefox ESR 38.x en versiones anteriores a 38.4 permite a atacantes remotos eludir la Same Origin Policy para un origen dirección IP y realizar ataques de cross-site scripting (XSS), añadiendo caracteres de espacio en blanco a una cadena de dirección IP."
    }
  ],
  "lastModified": "2026-06-17T00:31:59.650",
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