Critical Malicious Code Vulnerability in contosoapp Package

contosoapp Updated 13 Feb 2026

Summary

13/02/2026
CRITICAL
No i
Critical
Not published

MAL-2026-881: Malicious code in contosoapp (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The contosoapp package is a Node.js application designed for various functionalities within the npm ecosystem. It is widely used for its ease of integration and utility in web development. However, this package has been identified as containing malicious code, which poses significant security risks to any system that has it installed.

Vulnerability Detail

The vulnerability stems from the presence of embedded malicious code within the contosoapp package. This code can compromise the integrity of the host system, allowing unauthorized access to sensitive information such as secrets and keys. The malicious nature of this code means that any computer running this package should be considered fully compromised, with no guarantee that simply removing the package will eliminate all traces of the malware.

How To Fix

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

npm uninstall contosoapp

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

There are no effective workarounds for this vulnerability other than removing the package and securing your system. Ensure that you monitor your system for any unusual activity following the removal.

Conclusion

The discovery of malicious code within the contosoapp package poses a serious threat to users and their systems. Immediate action is required to remove the package and secure any sensitive information. Utilizing tools like Vulert can help in monitoring for such vulnerabilities in the future.

See every vulnerability recorded for contosoapp →

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FAQ

Immediately remove the contosoapp package and rotate any sensitive information stored on the affected system.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Check your application using the Vulert playground at Vulert Scanner.

No, it is not safe to reinstall the package until a patched version is released and verified to be free of malicious code.

Failure to address this vulnerability can lead to unauthorized access to sensitive data, potential data breaches, and complete system compromise.

Regularly monitor your system for unusual activity, update your software dependencies, and use tools like Vulert to stay informed about vulnerabilities.

How To Fix

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

npm uninstall contosoapp

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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