CVE-2026-56264

Crawl4AI - Arbitrary JavaScript Execution via /execute_js Endpoint

State: Published
Severity: 9.2 Critical
Published: Jun 30, 2026
Updated: Jul 14, 2026
Reserved: Jun 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	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	VulnCheck
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
Crawl4AICrawl4AI	before 0.8.7Affected 0.8.7Not affected

References

https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfgvendor-advisory
https://github.com/unclecode/crawl4aiproduct
VulnCheck Advisory: Crawl4AI - Arbitrary JavaScript Execution via /execute_js Endpointthird-party-advisory

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