CVE-2025-30360

webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser

Published Jun 3, 2025 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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 you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-16764 webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
Github GHSA Github GHSA GHSA-9jgg-88mc-972h webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
History
Type Values Removed Values Added
First Time appeared Webpack.js
Webpack.js webpack-dev-server
CPEs cpe:2.3:a:webpack.js:webpack-dev-server:*:*:*:*:*:*:*:*
Vendors & Products Webpack.js
Webpack.js webpack-dev-server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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 you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.
Title webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
Weaknesses CWE-346
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 3, 2025, 5:58 PM
Reserved
Mar 21, 2025, 2:12 PM
Status
Analyzed
Published
Jun 3, 2025, 6:15 PM
Modified
Jun 17, 2026, 9:08 AM
Severity
Moderate
Public date
Jun 3, 2025, 5:41 PM