CVE-2026-91942
Received Received - Intake

DOM-based XSS in Crawl4AI Docker Playground UI

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

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.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91942
EUVD
EUVD-2026-78799

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a DOM-based cross-site scripting (XSS) vulnerability in crawl4ai before version 0.9.3. It occurs in the Docker Playground UI where untrusted crawl results are assigned to element.innerHTML. Attackers can exploit this by crafting malicious PDFs containing event-handler markup to execute JavaScript in the Playground origin. This allows them to steal API tokens stored in sessionStorage for further unauthorized API abuse.

Impact Analysis

If you use crawl4ai before 0.9.3, attackers could steal your API tokens from sessionStorage, leading to unauthorized access to your APIs. This could result in data breaches, unauthorized actions on your behalf, or further exploitation of your systems.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate GDPR (data protection) and HIPAA (healthcare data privacy) requirements. Organizations using affected versions may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

Mitigation Strategies

Upgrade crawl4ai to version 0.9.3 or later to address the DOM-based XSS vulnerability in the Docker Playground UI.

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