Origin validation error in webpack-dev-server - CVE-2025-30360
Published: July 3, 2025
Vulnerability identifier: #VU112134
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-30360
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: webpack
Affected software:
webpack-dev-server
webpack-dev-server
Detailed vulnerability description
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to incorrect Origin validation in webpack-dev-server/lib/Server.js. A remote attacker can trick the application into connecting to a malicious website with a non-Chromium browser and and share its source code with it, a.k.a. cross-site WebSocket hijacking.
How to mitigate CVE-2025-30360
Install updates from vendor's website.
Sources
- https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127
- https://github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
- https://github.com/webpack/webpack-dev-server/commit/72efaab83381a0e1c4914adf401cbd210b7de7eb
- https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h