CVE-2018-14732: Webpack.js Webpack-Dev-Server

High severity, CVSS 7.5. EPSS: 2.6% chance of exploitation in the next 30 days.

An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR (Hot Module Replacement). Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1:8080/ connection from any origin.

Affected products

• Webpack.js Webpack-Dev-Server: before 3.1.6 (fixed in 3.1.6)

Published 2018-09-21. Last modified 2026-06-17.