CVE-2026-6402
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
描述
### 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 `<script>` 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 requests, but browsers only send these headers for [potentially trustworthy origins](https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy). Over plain HTTP, the headers are absent and the check is bypassed. An attacker who knows the dev server's host, port, and output path can exfiltrate all module source code by intercepting the webpack runtime's module registration. This does not affect Chrome 142+ (and other Chromium-based browsers) due to [local network access restrictions](https://developer.chrome.com/release-notes/142#local_network_access_restrictions). ### Patches Patched in webpack-dev-server >= 5.2.4 by setting `Cross-Origin-Resource-Policy: same-origin` on responses. ### Workarounds Run the dev server with HTTPS enabled (`--https` or `server.type: 'https'` in config). ### Resources - [GHSA-4v9v-hfq4-rm2v](https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-4v9v-hfq4-rm2v) (CVE-2025-30359) - original vulnerability - [GHSA-9jgg-88mc-972h](https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h) (CVE-2025-30360) - prior bypass
如何修補 CVE-2026-6402
要修補 CVE-2026-6402,請將受影響套件升級到下列已修補版本。
- —升級至 5.2.4 或更新版本
CVE-2026-6402 正在被利用嗎?
低 — EPSS 為 0.0%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- from 0, < 5.2.4