XSS in Crawl4ai
CVE-2026-56263
Crawl4AI before 0.8.7 contains a stored cross-site scripting vulnerability in the monitor dashboard that renders crawl URLs and error messages via innerHTML without escaping. An attacker can submit a crafted crawl request with malicious markup that executes in an operator's browser when viewing the dashboard.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Crawl4ai — versions 0, 0.8.7
- Kidocode Crawl4ai
Weakness classification (CWE)
References
- https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg (vendor-advisory, Third Party Advisory)
- https://github.com/unclecode/crawl4ai (Product, product)
- VulnCheck Advisory: Crawl4AI - Stored Cross-Site Scripting in Monitor Dashboard (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56263?
- CVE-2026-56263 is a medium-severity vulnerability in Crawl4ai, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-23.
- How severe is CVE-2026-56263?
- Medium severity. CVSS v3 base score is 6.1 out of 10.