CVE-2025-30359 (Medium) detected in webpack-dev-server-4.11.0.tgz

[mend-bolt-for-github]

CVE-2025-30359 - Medium Severity Vulnerability

Vulnerable Library - webpack-dev-server-4.11.0.tgz

Serves a webpack app. Updates the browser on changes.

Library home page: https://registry.npmjs.org/webpack-dev-server/-/webpack-dev-server-4.11.0.tgz

Path to dependency file: /ui/package.json

Path to vulnerable library: /ui/package.json

Dependency Hierarchy:

• @postgres.ai/shared-3.5.0.tgz (Root Library)
  • react-scripts-5.0.1.tgz
    • ❌ webpack-dev-server-4.11.0.tgz (Vulnerable Library)

Found in base branch: master

Vulnerability Details

webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when they access a malicious web site. Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject a malicious script in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables. By using "Function::toString" against the values in "webpack_modules", the attacker can get the source code. Version 5.2.1 contains a patch for the issue.

Publish Date: 2025-06-03

URL: CVE-2025-30359

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-4v9v-hfq4-rm2v

Release Date: 2025-06-03

Fix Resolution: https://github.com/webpack/webpack-dev-server.git - v5.2.1

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