CVE-2026-91942— crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML
Quick assessment
Affected
unclecode crawl4ai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
crawl4ai 在 0.9.3 版本之前，其 Docker Playground 界面中存在基于 DOM 的跨站脚本（XSS）漏洞。该漏洞源于将不可信的爬取结果直接赋值给 。攻击者可以通过构造包含事件处理器标记的恶意 PDF，在 Playground 源中执行 JavaScript 代码，从而窃取 中的 API 令牌，进而实现经过身份验证的 API 滥用。
Possible ATT&CK Techniques 2 AI
T1557.001 · Name Resolution Poisoning and SMB Relay T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-91942
Vulnerability Information
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Vulnerability Title
crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-91942
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-91942 (2)
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🔗 crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML | Advisories | VulnCheck third-party-advisory
Same Patch Batch · unclecode · 2026-09-15 · 5 CVEs total
| CVE-2026-91943 | 7.7 HIGH | Crawl4AI before 0.9.3 SSRF via PDFContentScrapingStrategy |
| CVE-2026-91941 | 7.5 HIGH | Crawl4AI before 0.9.3 Denial of Service via PDFContentScrapingStrategy |
| CVE-2026-91940 | 7.5 HIGH | crawl4ai before 0.9.3 Arbitrary File Write via PDFContentScrapingStrategy |
| CVE-2026-91944 | 6.1 MEDIUM | crawl4ai before 0.9.3 DOM-based XSS via Playground UI |
IV. Related Vulnerabilities
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CVE-2026-91944
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CVE-2026-91943
Crawl4AI before 0.9.3 SSRF via PDFContentScrapingStrategy -
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V. Comments for CVE-2026-91942
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