Malicious Code Detected in cssnapapp: A Critical Security Alert

cssnapapp Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-17799: Malicious code in cssnapapp (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The cssnapapp package is a tool designed for managing CSS snapshots in web applications. It allows developers to capture and manipulate CSS styles efficiently. However, it has been identified to contain malicious code, posing significant security risks to applications that utilize it.

Vulnerability Detail

The vulnerability in cssnapapp arises from the inclusion of malicious code within the package. This code can potentially compromise the security of applications using cssnapapp, leading to unauthorized access, data breaches, or other malicious activities. The issue was introduced in version 0 and affects all subsequent versions.

How To Fix

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

npm uninstall cssnapapp

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, consider using alternative packages for managing CSS snapshots that do not have known vulnerabilities. Always ensure to review the security status of any package before integrating it into your project.

Conclusion

The cssnapapp package has been identified to contain malicious code, posing serious security risks. It is crucial for developers to take immediate action by uninstalling the package and monitoring for updates or alternatives. Utilizing tools like Vulert can help ensure ongoing security in your applications.

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FAQ

cssnapapp is an npm package used for managing CSS snapshots in web applications.

The malicious code can lead to unauthorized access and potential data breaches in applications using the package.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without needing to sign up.

Currently, there is no patched version available. It is recommended to uninstall the package until a secure version is released.

You should uninstall cssnapapp immediately and consider using alternative packages until a secure version is available.

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How To Fix

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

npm uninstall cssnapapp

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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