Critical Malicious Code Vulnerability in @vtim/xss-poc Package
Summary
MAL-2026-1440: Malicious code in @vtim/xss-poc (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The @vtim/xss-poc package is an npm library designed for testing cross-site scripting (XSS) vulnerabilities. It is intended for developers to simulate and analyze XSS attacks in a controlled environment. However, this package has been compromised, embedding malicious code that poses significant security risks to any system where it is installed.
Vulnerability Detail
The vulnerability originates from the inclusion of malicious code within the @vtim/xss-poc package. This code can fully compromise any computer that has the package installed, allowing an attacker to gain unauthorized access to sensitive information, including secrets and keys stored on the affected system. The malicious nature of the code is classified under CWE-506, indicating that it contains embedded malicious code.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall @vtim/xss-pocIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a workaround, ensure that your application does not rely on the @vtim/xss-poc package. If you need similar functionality, consider using alternative libraries that are known to be secure and actively maintained. Always review the security of third-party packages before installation.
Conclusion
The @vtim/xss-poc package has been identified as containing malicious code that can compromise systems. Immediate action is required to uninstall the package and secure sensitive information. Utilizing tools like Vulert can help in monitoring for such vulnerabilities in the future.
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FAQ
Immediately uninstall the package using npm uninstall @vtim/xss-poc and rotate any sensitive information stored on the affected system.
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No, there is currently no patched version of the @vtim/xss-poc package available. The only solution is to uninstall it.
Keeping the package installed can lead to full compromise of your system, allowing attackers to access sensitive data and potentially control your computer.
Regularly audit your dependencies, use tools like Vulert for real-time monitoring, and only install packages from trusted sources.
