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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.

UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.9.3之前版本存在跨站脚本漏洞，该漏洞源于Playground UI中forceHighlightElement()函数将textContent赋回innerHTML并重新将JSON响应解析为HTML，导致基于DOM的跨站脚本，攻击者可通过页面标题等被爬取内容注入恶意脚本，窃取sessionStorage中的API令牌并获取服务器完全控制权。

CVSS 6.1 · Medium EPSS 0.26% · P18

Affected Version Matrix 2

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.9.3 affected
0.9.3 unaffected
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I. Basic Information for CVE-2026-91944

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
Vulnerability Title
UncleCode Crawl4AI 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.9.3之前版本存在跨站脚本漏洞，该漏洞源于Playground UI中forceHighlightElement()函数将textContent赋回innerHTML并重新将JSON响应解析为HTML，导致基于DOM的跨站脚本，攻击者可通过页面标题等被爬取内容注入恶意脚本，窃取sessionStorage中的API令牌并获取服务器完全控制权。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-91944

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III. Intelligence Information for CVE-2026-91944

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Vendor Advisories for CVE-2026-91944 (2)

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