Vulnerability · Published Jun 3, 2025 · Assigned by GitHub_M
CVE-2025-30360webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
Medium 6.5
In plain English
A medium-severity security flaw in webpack-dev-server from webpack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | webpack-dev-server | 5.2.1 | GHSA-9jgg-88mc-972h |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| webpack | webpack-dev-server | < 5.2.1 |
Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
References
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h x_refsource_CONFIRM
- https://github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e x_refsource_MISC
- https://github.com/webpack/webpack-dev-server/commit/72efaab83381a0e1c4914adf401cbd210b7de7eb x_refsource_MISC
- https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127 x_refsource_MISC