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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (14.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/unclecode/crawl4ai/security/advisories/GHSA-7g3g-vhm6-79f3 (vendor-advisory)
- www.vulncheck.com/advisories/crawl4ai-before-0.9.3-cross-site-scripting-via-inn… (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.