{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-56290",
  "revision": 1,
  "title": "Page Builder CK for Joomla — unauthenticated upload to RCE",
  "summary": "The Joomlack page builder extension for Joomla before 3.6.0 (Page Builder CK) lets anyone upload a file of any type, so an attacker can put an executable script on the site and run it, taking over the web server.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.30866,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2026-07-07",
    "prerequisites": "Network access to a Joomla site running the extension; no account needed."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "Page Builder CK 3.6.0"
    ]
  },
  "mitre_attack": [
    "T1190",
    "T1505.003"
  ],
  "kill_chain": "initial_access",
  "recommended_action": "Update Page Builder CK to 3.6.0 or later now; exploit code is public, so sweep the upload folders for unfamiliar scripts before reopening the site.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-56290",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "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": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2026-56290",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "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-2026-56290",
      "retrieved_at": "2026-09-23T07:33:20.707Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56290",
      "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://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3"
    },
    {
      "type": "exploit",
      "url": "https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/"
    }
  ],
  "published_at": "2026-06-29T15:16:42.360Z",
  "issued_at": "2026-09-23T07:33:20.707Z",
  "tags": [
    "joomla",
    "joomlack",
    "page-builder-ck",
    "file-upload",
    "webshell",
    "kev"
  ]
}