Malicious Code Detected in fusion-theme Package - Security Alert

fusion-theme Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-21080: Malicious code in fusion-theme (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The fusion-theme package is a popular npm library used for creating and managing themes in web applications. It provides various functionalities such as customizable styles, layout options, and theme management features. However, recent findings have revealed that this package contains malicious code, posing significant security risks to applications that utilize it.

Vulnerability Detail

The vulnerability in the fusion-theme package originates from the inclusion of malicious code that can compromise the security of applications using this package. This code may allow unauthorized access, data theft, or other harmful actions within the affected applications. The malicious nature of this code makes it imperative for developers to take immediate action to mitigate potential risks.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall fusion-theme

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

As a temporary workaround, you may consider removing the fusion-theme package from your project until a secure version is available. You can do this by executing the command: 'npm uninstall fusion-theme'. This will help mitigate the risk of exposure to the malicious code.

Conclusion

The discovery of malicious code in the fusion-theme package highlights the importance of regularly monitoring and updating dependencies in software projects. Developers should take immediate action to update or remove the affected package to safeguard their applications from potential security threats.

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FAQ

The fusion-theme package is an npm library designed for theme management in web applications, offering various customization options.

The malicious code found in the fusion-theme package can lead to unauthorized access and potential data theft in applications using it.

You can use Vulert, a tool that monitors and alerts for open-source vulnerabilities. Simply upload your package-lock.json file to check for vulnerabilities without needing to install any software.

Yes, a patched version of the fusion-theme package is available. You can update to the latest version using 'npm update fusion-theme'.

If you cannot update the package right away, consider uninstalling it as a temporary measure to prevent exposure to the malicious code.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall fusion-theme

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

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