CVE-2025-30359
CVE-2025-30359 · webpack-dev-server users' source code may be stolen when they access a malicious web site
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 5.3 · Medium · EPSS 0.6% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
webpack-dev-server
- Versions
- < 5.2.1: Affected
No fix published
webpack-dev-server npm
- Affected ranges
- SEMVER: < 5.2.1
Update to 5.2.1