Crawl4AI - Arbitrary JavaScript Execution via /execute_js Endpoint

{
  "id": "888cc82e93f3028e2f65fdabf6a97e455b8ba67dc5394ef1dafb65d3097036f6",
  "url": "https://osv.dev/vulnerability/CVE-2026-56264",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Crawl4AI - Arbitrary JavaScript Execution via /execute_js Endpoint",
    "summary": "Crawl4AI before 0.8.7 contains an arbitrary JavaScript execution vulnerability in the Docker API server's /execute_js endpoint, which accepts and executes arbitrary user-supplied JavaScript in the server's browser context with --disable-web-security enabled. An attacker can execute arbitrary JavaScript and, combined with the browser's relaxed security settings, perform server-side request forgery against internal services.",
    "evidence": "osv:CVE-2026-56264",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-56264",
      "aliases": [
        "CVE-2026-56260",
        "CVE-2026-56261",
        "CVE-2026-56262",
        "CVE-2026-56263",
        "CVE-2026-56264",
        "CVE-2026-56265",
        "CVE-2026-56266",
        "GHSA-365w-hqf6-vxfg",
        "GHSA-53rg-46cm-4g2v",
        "GHSA-8qrg-7j2f-rf2h",
        "GHSA-f23g-2f38-gg94",
        "GHSA-g2pv-76hm-j4x9",
        "GHSA-r9hw-78q5-478g",
        "GHSA-xrfj-6m49-wfmm",
        "PYSEC-2026-229",
        "PYSEC-2026-230",
        "PYSEC-2026-239",
        "PYSEC-2026-3443",
        "PYSEC-2026-3449",
        "PYSEC-2026-596",
        "PYSEC-2026-798"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/unclecode/crawl4ai",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7b280d36b150b544bf0994285b4755dca18c2149"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:kidocode:crawl4ai:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "docker-rebuild-v0.8.6",
            "v0.8.6",
            "v0.7.4",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "vr0.6.3",
            "v0.6.3",
            "vr0.6.0",
            "vr0.6.0rc1",
            "v0.5.0.post1",
            "v0.4.243",
            "v0.4.24",
            "v0.3.745",
            "v.3.72",
            "v0.3.6",
            "0.3.4",
            "v0.3.3",
            "v0.3.0",
            "v0.2.77",
            "v0.0.75",
            "v0.2.74",
            "v0.2.73",
            "v0.2.72",
            "v0.2.71",
            "v0.2.7",
            "v0.2.6",
            "v0.2.4",
            "v0.2.1",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56264.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.690615396Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56264.json",
        "https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-56264",
        "https://www.vulncheck.com/advisories/crawl4ai-arbitrary-javascript-execution-via-execute-js-endpoint",
        "https://github.com/unclecode/crawl4ai"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-94"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56264.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-56260",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-56261",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-56262",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-56263",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-56264",
        "evidence": "/id"
      },
      {
        "value": "CVE-2026-56265",
        "evidence": "/aliases"
      },
      {
        "value": "CVE-2026-56266",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492457,
  "published_at": "2026-06-30T22:08:26.6+00:00"
}