---
id: CVE-2026-56264
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-…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-94
vendor: Crawl4AI
product: Crawl4AI
affected:
  - Crawl4AI < 0.8.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-01T14:59:05.343380Z'
published: '2026-06-30'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:05:50.381Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56264'
references:
  - url: >-
      https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg
    label: GitHub Security Advisory (GHSA-365w-hqf6-vxfg)
  - url: 'https://github.com/unclecode/crawl4ai'
    label: 'https://github.com/unclecode/crawl4ai'
  - url: >-
      https://www.vulncheck.com/advisories/crawl4ai-arbitrary-javascript-execution-via-execute-js-endpoint
    label: >-
      VulnCheck Advisory: Crawl4AI - Arbitrary JavaScript Execution via
      /execute_js Endpoint
tags:
  - cve.org
epss: 0.00488
epssPercentile: 0.42261
ingestedAt: '2026-11-08T14:51:22.362Z'
---

## Overview

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.

## Affected

- `Crawl4AI < 0.8.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.