CVE-2025-30359

Описание

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.

An information exposure flaw has been discovered in webpack-dev-server. The request for classic script by a script tag is not subject to the same origin policy, allowing an attacker to inject a malicious script in their site and run the script. The attacker is required to know the port and the output entrypoint script path in order to successfully exploit this vulnerability, but successful exploitation can result in the source code being stolen for users that use a predictable port and output path for the entrypoint script.