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CVE-2026-91944— crawl4ai before 0.9.3 DOM-based XSS via Playground UI

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 Playground 界面中存在基于 DOM 的跨站脚本（XSS）漏洞。具体来说，函数将赋值回，导致 JSON 响应被重新解析为 HTML。攻击者可以通过爬取页面中的内容（如页面标题）注入恶意脚本，从而窃取操作员存储在中的 API 令牌，进而获得对服务器的完全控制权。

CVSS 6.1 · Medium Updated Sep 15, 2026

Possible ATT&CK Techniques 2 AI

T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise

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Vulnerability Information

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Vulnerability Title

crawl4ai before 0.9.3 DOM-based XSS via Playground UI

Source: CVE Program / CVE List V5

Vulnerability Description

crawl4ai versions before 0.9.3 contain a DOM-based cross-site scripting vulnerability in the Playground UI where the forceHighlightElement() function assigns textContent back to innerHTML, re-parsing JSON responses as HTML. Attackers can inject malicious scripts through crawled page content like the page title to steal the operator's API token from sessionStorage and gain full server control.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/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

Vendor	Product	Affected Versions	CPE	Subscribe
unclecode	crawl4ai	0 ~ 0.9.3	-

II. Public POCs for CVE-2026-91944

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-91944

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Vendor Advisories for CVE-2026-91944 (2)

🔗 DOM-based XSS in Docker Playground UI leads to operator API-token theft · Advisory · unclecode/crawl4ai · GitHub Read full article vendor-advisory
🔗 crawl4ai before 0.9.3 DOM-based XSS via Playground UI | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-91944

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-2026-91942	5.4 MEDIUM	crawl4ai before 0.9.3 Cross-Site Scripting via innerHTML

IV. Related Vulnerabilities

Same product: crawl4ai

Same vendor: unclecode

Same weakness: CWE-79

V. Comments for CVE-2026-91944

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-91944— crawl4ai before 0.9.3 DOM-based XSS via Playground UI

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-91944

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-91944

III. Intelligence Information for CVE-2026-91944

Vendor Advisories for CVE-2026-91944 (2)

Same Patch Batch · unclecode · 2026-09-15 · 5 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-91944

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