webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

Impact When webpack-dev-server is running on a non-HTTPS origin the default, cross-origin requests from malicious websites can load the dev server's JavaScript bundles via tags. The fix introduced in v5.2.1 CVE-2025-30359 relied on Sec-Fetch-Mode and Sec-Fetch-Site request headers to block these...

GHSA-79CF-XCQC-C78W webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

Impact When webpack-dev-server is running on a non-HTTPS origin the default, cross-origin requests from malicious websites can load the dev server's JavaScript bundles via tags. The fix introduced in v5.2.1 CVE-2025-30359 relied on Sec-Fetch-Mode and Sec-Fetch-Site request headers to block these...

EUVD-2026-29404

webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins...

NPM: webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

NPM: webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins vulnerability discovered by ? in WordPress Npm webpack-dev-server versions = 5.2.3...

Linux Distros Unpatched Vulnerability : CVE-2026-6402

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 versions up to and including 5.2.3 are vulnerable to cross-origin source code exposure when serving over a non-potentially trustworthy origin...

SUSE CVE-2026-6402

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...

CVE-2026-6402

A flaw was found in webpack-dev-server. When the development server operates over plain HTTP, a remote attacker can exploit a cross-origin source code exposure vulnerability. This allows a malicious website, visited by a developer, to load the bundled application source code as a script and read ...

Exposed Dangerous Method or Function

Overview org.webjars.npm: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 in Server.js, when handling non-HTTPS responses. ...

@4399ywkf/core (>=5.0.0, <=5.0.32), @all-star/base (>=0.17.0, <=0.18.2) +320 more potentially affected by CVE-2025-30359 +1 more via webpack-dev-server (>=5.0.0, <=5.2.3)

webpack-dev-server NPM version =5.0.0, =5.0.0, =0.17.0, =0.17.0, =0.17.0, =8.0.0-next.2, =18.0.0-beta.3, =18.0.0-beta.3, =18.2.6-RC-1, =18.0.0, =18.0.0-next.0, =1.0.5-beta.4, =1.0.1-beta.1, =0.18.3, =0.0.1, =0.3.2-develop-1171, =1.2.0-pillar-v4.0 and more Source cves: CVE-2025-30359, CVE-2026-640...

Exposed Dangerous Method or Function

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 in Server.js, when handling non-HTTPS responses. An attacker can...

CVE-2026-6402

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...

CVE-2026-6402

The CVE-2026-6402 entry concerns webpack-dev-server (versions up to 5.2.3) and a cross-origin source code exposure when served over non-HTTPS/or untrusted origins. The root cause is that the prior fix relied on Sec-Fetch-Mode and Sec-Fetch-Site headers, which browsers omit for non-trustworthy ori...

CVE-2026-6402

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...

CVE-2026-6402 webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

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...

CVE-2026-6402 webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

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...

CVE-2026-6402 webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins

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...

PT-2026-39959

Name of the Vulnerable Software and Affected Versions webpack-dev-server versions prior to 5.2.4 Description Cross-origin source code exposure occurs when serving over a non-potentially trustworthy origin, such as plain HTTP. The issue arises because the previous fix relied on Sec-Fetch-Mode and...

CVE-2026-6402: Exposed Dangerous Method or Function

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...

The vulnerabilities of the React frontend building libraries React-server-dom-parcel, React-server-dom-turbopack, and React-server-dom-webpack allow attackers to cause service failures.

The vulnerability of the React frontend library packages react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack involves uncontrolled resource consumption. Exploiting this vulnerability can allow an attacker to cause service failures by sending specially crafted HTTP...

webpack-dev-server 安全漏洞

webpack-dev-server is an open-source application developed by webpack. Versions of webpack-dev-server prior to version 5.2.3 contained security vulnerabilities. These vulnerabilities stemmed from exposure to cross-origin code. When it provided services through non-potentially trusted sources, suc...