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Vulnerability details

6.5/10
CVSS 3.1
CVE-2026-6402
false_positive Published 2026-05-12 Updated 2026-06-17
NVD MITRE OpenCVE
Vulnerability Data from Dependency-Track
Affected versions
Score
6.5 CVSS 3.1 NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Description
webpack-dev-server versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when serving over a non-potentially trustworthy origin such as plain HTTP. The previous fix relied on the Sec-Fetch-Mode and Sec-Fetch-Site request headers, which browsers omit for non-trustworthy origins, allowing a malicious site to load the bundled source as a script and read it across origins. Impact: an attacker controlling a website visited by a developer running webpack-dev-server can recover the application source code when the dev server runs over HTTP at a guessable host and port. Chromium based browsers from Chrome 142 onward are not affected due to local network access restrictions. Upgrade to webpack-dev-server 5.2.4 or later, which sets Cross-Origin-Resource-Policy: same-origin on responses.
Same vulnerability as
GHSA-79cf-xcqc-c78w false_positive according to EUVD-2026-29404
Analysis Read only
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