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.

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 ma…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.5th percentile) — read the EPSS interpretation.

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.

Affected products

Crawl4ai — versions 0, 0.8.7
Kidocode Crawl4ai

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

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.