Malicious Code Detected in browser-client-neptune Package - Security Risk Identified

browser-client-neptune Updated 28 Nov 2025

Summary

28/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-191484: Malicious code in browser-client-neptune (npm). Affects browser-client-neptune versions 99.99.91. No fix is published. How to fix ↓

Free scan

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.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats
SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml
Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile
Javascript package-lock.json · yarn.lock · pnpm-lock.yaml
PHP composer.lock
Python poetry.lock · requirements.txt · Pipfile.lock
Go go.mod
Rust Cargo.lock
Ruby Gemfile.lock
Dart pubspec.lock
C/C++ conan.lock
Elixir mix.lock
Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Sponsored MarkAI Find prospects already talking about the problem you solve AI watches the communities your customers use to find qualified prospects, then alerts you when a conversation is worth joining. See MarkAI

Background

The 'browser-client-neptune' package is a JavaScript library available through npm, primarily used for browser-related functionalities. It is designed to facilitate various client-side operations in web applications. However, this package has been flagged for malicious behavior, specifically due to its communication with domains known for malicious activities, raising significant security concerns for developers and users alike.

Vulnerability Detail

The vulnerability in the 'browser-client-neptune' package arises from its version 99.99.91, which has been identified as malicious by the OpenSSF Package Analysis project. The package's behavior includes communicating with a domain that is associated with malicious activities, potentially compromising the security of applications that utilize it. This could lead to data breaches, unauthorized access, or other forms of cyberattacks, making it critical for users to address this issue promptly.

How To Fix

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

npm uninstall browser-client-neptune

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 removing the 'browser-client-neptune' package from your project until a secure version is released. You can do this by running the following command: npm uninstall browser-client-neptune. This will help mitigate the risk associated with the malicious code.

Conclusion

The 'browser-client-neptune' package has been identified as malicious due to its communication with harmful domains. It is crucial for developers using this package to take immediate action by updating or removing it to safeguard their applications from potential security threats.

See every vulnerability recorded for browser-client-neptune →

Share this vulnerability

FAQ

The 'browser-client-neptune' package is a JavaScript library used for client-side operations in web applications, available through npm.

It is considered malicious because it communicates with a domain associated with malicious activities, posing a security risk.

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

You should update the package to a secure version using the command: npm update browser-client-neptune, or uninstall it until a patch is available.

Failing to address this vulnerability could lead to data breaches, unauthorized access, and other cyberattacks, compromising the security of your application.

How To Fix

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

npm uninstall browser-client-neptune

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 →

Subscribe to Vulert on Telegram
Daily digest of new CVEs, critical and high severity, affected packages and fixes — plus a weekly roundup.
Join the channel →
Help improve this record
Report an issue or send feedback