{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2018-15133",
  "revision": 1,
  "title": "Laravel — a cookie unserialized into code execution",
  "summary": "Laravel through 5.5.40 and 5.6.29 unserializes a value taken straight from a request cookie, so an attacker who knows the application key runs code on the server. That key is normally secret, so this needs an earlier leak.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 8.1,
    "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.76814,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "high",
    "kev_added": "2024-01-16",
    "prerequisites": "The attacker must know the application encryption key."
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1059"
  ],
  "kill_chain": "execution",
  "recommended_action": "Upgrade Laravel past 5.6.29, and rotate the application key anywhere it may have leaked — that key is the only thing between a request and code execution.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2018-15133",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2018-15133",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2018-15133",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-15133",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://laravel.com/docs/5.6/upgrade#upgrade-5.6.30"
    },
    {
      "type": "exploit",
      "url": "http://packetstormsecurity.com/files/153641/PHP-Laravel-Framework-Token-Unserialize-Remote-Command-Execution.html"
    }
  ],
  "published_at": "2018-08-09T19:29:00.333Z",
  "issued_at": "2026-09-24T12:52:19.575Z",
  "tags": [
    "laravel",
    "php",
    "deserialization",
    "web-framework",
    "kev"
  ]
}