Malicious Code Vulnerability in mfasolver Package
Summary
MAL-2026-17663: Malicious code in mfasolver (npm). Affects mfasolver versions 1.0.0. No fix is published. How to fix ↓
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Background
The mfasolver package is an npm library designed to assist with multi-factor authentication processes. It is intended for developers looking to integrate MFA solutions into their applications. However, this package has been found to contain a significant vulnerability that allows for the execution of malicious code, posing a serious risk to users and their applications.
Vulnerability Detail
The vulnerability originates from the mfasolver package's dependency on an off-registry HTTP source for its only runtime dependency, node-net-pool. This source points to a mutable GitHub repository, which means that the code fetched during installation can change at any time without notice. The absence of a commit pin and integrity hash allows an attacker to inject malicious code that will be executed upon installation. Additionally, the package disables certificate validation for TLS connections to discord.com, further exposing users to potential security risks.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall mfasolverIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, avoid using the mfasolver package until a secure version is released. If you must use it, consider implementing strict network policies to limit its ability to make outbound connections, especially to untrusted sources.
Conclusion
The mfasolver package has a critical vulnerability that allows for the execution of malicious code due to its reliance on an untrusted dependency. It is essential for developers to take immediate action by updating the package or implementing workarounds to protect their applications. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the security of your software.
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FAQ
The mfasolver package is used for integrating multi-factor authentication solutions into applications.
The vulnerability allows for the execution of malicious code, which can compromise your application's security and data integrity.
Check the npm registry for updates to the mfasolver package. If a patched version is available, updating is recommended.
If you have installed the mfasolver package, immediately review your application for any suspicious activity and consider removing the package until it is updated.
You can use tools like Vulert, which monitors and alerts for open-source vulnerabilities in your software using just package-lock.json. You can check for vulnerabilities in your application using the Vulert playground without any signup.
