What is CVE-2026-91942?

CVE-2026-91942 is a medium-severity vulnerability in Unclecode Crawl4ai, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-15.

How severe is CVE-2026-91942?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Unclecode Crawl4ai

CVE-2026-91942

crawl4ai before 0.9.3 contains a DOM-based cross-site scripting vulnerability in the Docker Playground UI that assigns untrusted crawl results to element.innerHTML. Attackers can craft malicious PDFs with event-handler markup to execute JavaScript in the Playground origin and steal API tokens from sessionStorage for authenticated API abuse.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Unclecode Crawl4ai

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91942?: CVE-2026-91942 is a medium-severity vulnerability in Unclecode Crawl4ai, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-09-15.
How severe is CVE-2026-91942?: Medium severity. CVSS v3 base score is 5.4 out of 10.