Malicious Code Detected in @postman/mcp-ui-client - Security Alert
Summary
MAL-2025-190902: Malicious code in @postman/mcp-ui-client (npm). Affects @postman/mcp-ui-client versions 5.5.1 – 5.5.2. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The @postman/mcp-ui-client package is a component of the Postman ecosystem, primarily used for building user interfaces in API development workflows. It provides essential functionalities for developers to interact with APIs efficiently. However, recent findings have revealed that this package contains malicious code, posing significant security risks to applications that rely on it.
Vulnerability Detail
The vulnerability originates from the inclusion of malicious code within the @postman/mcp-ui-client package. This code can potentially compromise the integrity of applications using the package, leading to unauthorized access, data breaches, or other malicious activities. The affected versions identified are 5.5.1 and 5.5.2, which have been flagged by Amazon Inspector as containing this harmful code.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall @postman/mcp-ui-clientIf 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
If immediate updating is not feasible, consider removing the @postman/mcp-ui-client package from your project until a secure version is released. You can do this by running the command: 'npm uninstall @postman/mcp-ui-client'. This will prevent the execution of any malicious code associated with the package.
Conclusion
The discovery of malicious code in the @postman/mcp-ui-client package highlights the importance of maintaining secure dependencies in software development. It is essential to monitor for vulnerabilities and apply updates promptly to safeguard applications from potential threats.
See every vulnerability recorded for @postman/mcp-ui-client →
FAQ
The malicious code is designed to compromise application security, potentially leading to unauthorized access or data breaches.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without any signup.
The affected versions are 5.5.1 and 5.5.2.
You should check the official npm repository for a patched version of @postman/mcp-ui-client and update your package accordingly.
Consider uninstalling the package temporarily to prevent any potential security risks until a secure version is available.
