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

Quick assessment

Affected
webpack-dev-server webpack-dev-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

webpack-dev-server是webpack开源的一个提供webpack的应用程序。 webpack-dev-server 5.2.3及之前版本存在安全漏洞，该漏洞源于跨源源代码暴露问题，当通过非潜在可信源如纯HTTP提供服务时，可能导致恶意网站加载捆绑脚本并跨源读取。

CVSS 5.3 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
webpack-dev-server webpack-dev-server < 5.2.4 affected
5.2.4 unaffected
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I. Basic Information for CVE-2026-6402

Vulnerability Information
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Vulnerability Title
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5
Vulnerability Title
webpack-dev-server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
webpack-dev-server是webpack开源的一个提供webpack的应用程序。 webpack-dev-server 5.2.3及之前版本存在安全漏洞，该漏洞源于跨源源代码暴露问题，当通过非潜在可信源如纯HTTP提供服务时，可能导致恶意网站加载捆绑脚本并跨源读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
webpack-dev-server webpack-dev-server 0 ~ 5.2.4 -

II. Public POCs for CVE-2026-6402

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III. Intelligence Information for CVE-2026-6402

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Vendor Advisories for CVE-2026-6402 (1)

IV. Related Vulnerabilities

Same product: webpack-dev-server
Same vendor: webpack-dev-server
Same weakness: CWE-749

V. Comments for CVE-2026-6402

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