CVE-2026-56264

HIGH 8.1

Crawl4AI - Arbitrary JavaScript Execution via /execute_js Endpoint

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-94
Vendor	crawl4ai
Product	crawl4ai
Published	Jun 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

Crawl4AI / Crawl4AI

0 < 0.8.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg github.com: https://github.com/unclecode/crawl4ai vulncheck.com: https://www.vulncheck.com/advisories/crawl4ai-arbitrary-javascript-execution-via-execute-js-endpoint