Exposed Dangerous Method or Function Affecting webpack-dev-server package, versions <5.2.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-WEBPACKDEVSERVER-10300777
- published4 Jun 2025
- disclosed3 Jun 2025
- creditsapphi-red
Introduced: 3 Jun 2025
NewCVE-2025-30359 (opens in a new tab)How to fix?
Upgrade webpack-dev-server to version 5.2.1 or higher.
Overview
webpack-dev-server is an Uses webpack with a development server that provides live reloading. It should be used for development only.
Affected versions of this package are vulnerable to Exposed Dangerous Method or Function via the __webpack_modules__ object. An attacker can extract sensitive source code by injecting a malicious script into their site that utilizes Function::toString to access and serialize the functions stored within __webpack_modules__.
Note: This is only exploitable if the attacker knows both the specific port and the output entrypoint script path.