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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2025-30359)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2025-30359)

ID	Name	Product	Family	Severity
264715	Linux Distros Unpatched Vulnerability : CVE-2025-30359	Nessus	Misc.	medium
427836	SCA: security update for webpack-dev-server (GHSA-4v9v-hfq4-rm2v)	Tenable Cloud Security	SCA Checks	medium
427836	SCA: security update for webpack-dev-server (GHSA-4v9v-hfq4-rm2v)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2025-30359

medium

Tenable Plugins

medium

medium

medium