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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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.

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Docker Playground UI将不受信任的爬取结果赋值给element.innerHTML，容易受到基于DOM的跨站脚本攻击，可能导致攻击者通过特制带有事件处理标记的恶意PDF在Playground源中执行JavaScript，并窃取sessionStorage中的API令牌用于经身份验证的API滥用。

CVSS 5.4 · Medium EPSS 0.24% · P15

Affected Version Matrix 2

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.9.3 affected
0.9.3 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-91942

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
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Docker Playground UI将不受信任的爬取结果赋值给element.innerHTML，容易受到基于DOM的跨站脚本攻击，可能导致攻击者通过特制带有事件处理标记的恶意PDF在Playground源中执行JavaScript，并窃取sessionStorage中的API令牌用于经身份验证的API滥用。
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-2026-91942

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-91942

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-91942 (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-2026-91944 6.1 MEDIUM crawl4ai before 0.9.3 DOM-based XSS via Playground UI

IV. Related Vulnerabilities

Same product: crawl4ai
Same vendor: unclecode
Same weakness: CWE-79