Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-91942crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML
Medium 5.4
In plain English
A medium-severity cross-site scripting in crawl4ai from unclecode. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 85.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
References
- GitHub Security Advisory (GHSA-7g3g-vhm6-79f3) vendor-advisory
- VulnCheck Advisory: crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML third-party-advisory