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CVE-2018-5176

Status: ModifiedMedium (6.1)—

The JSON Viewer displays clickable hyperlinks for strings that are parseable as URLs, including "javascript:" links. If a JSON file contains malicious JavaScript script embedded as "javascript:" links, users may be tricked into clicking and running this code in the context of the JSON Viewer. This can allow for the theft of cookies and authorization tokens which are accessible to that context. This vulnerability affects Firefox < 60.

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-2018-5176",
  "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:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV30": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.0/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
      }
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  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "60",
              "versionType": "custom"
            }
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        }
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  ],
  "published": "2018-06-11T21:29:16.077",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/104139",
      "tags": [
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        "VDB Entry"
      ],
      "source": "security@mozilla.org"
    },
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      "tags": [
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        "VDB Entry"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1442840",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://usn.ubuntu.com/3645-1/",
      "tags": [
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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": "http://www.securityfocus.com/bid/104139",
      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The JSON Viewer displays clickable hyperlinks for strings that are parseable as URLs, including \"javascript:\" links. If a JSON file contains malicious JavaScript script embedded as \"javascript:\" links, users may be tricked into clicking and running this code in the context of the JSON Viewer. This can allow for the theft of cookies and authorization tokens which are accessible to that context. This vulnerability affects Firefox < 60."
    },
    {
      "lang": "es",
      "value": "JSON Viewer muestra hipervínculos que se pueden hacer clic en ellos para cadenas que son analizables sintácticamente como URL, incluyendo enlaces \"javascript:\". Si un archivo JSON contiene scripts JavaScript maliciosos incrustados como enlaces \"javascript:\", se puede engañar a los usuarios para que hagan clic y ejecuten este código en el contexto de JSON Viewer. Esto puede permitir el robo de cookies y tokens de autorización que son accesibles a ese contexto. Esta vulnerabilidad afecta a las versiones anteriores a la 60 de Firefox."
    }
  ],
  "lastModified": "2026-06-17T01:59:46.357",
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}