NPM: webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

NPM: webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies vulnerability discovered by ? in WordPress Npm webpack-dev-server versions 5.2.5...

EUVD-2026-36729

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies...

GHSA-MX8G-39Q3-5C79 webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Impact When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Impact When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

GHSA-X6QJ-4H56-5RJ5 @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)

Summary This is an incomplete fix for GHSA-6m52-m754-pw2g. Source code may still be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address e.g. nuxt dev --host and the developer opens a malicious site on the same network. Details The fix for...

EUVD-2026-36421

@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent incomplete fix for GHSA-6m52-m754-pw2g...

@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)

Summary This is an incomplete fix for GHSA-6m52-m754-pw2g. Source code may still be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address e.g. nuxt dev --host and the developer opens a malicious site on the same network. Details The fix for...

Exploit for Improper Access Control in Vitejs Vite

CVE-2025-30208 Using a special raw import query string on a...

GHSA-RQ7W-G337-39QQ Nuxt: Dev server discloses project absolute path and persistent workspace UUID via `/.well-known/appspecific/com.chrome.devtools.json`

Summary When running nuxt dev, Nuxt registers an unauthenticated route at /.well-known/appspecific/com.chrome.devtools.json that returns the absolute filesystem path of the project root and a per-project UUID persisted to nodemodules/.cache/nuxt/chrome-workspace.json. The route is enabled by...

NPM: Nuxt: Dev server discloses project absolute path and persistent workspace UUID via `/.well-known/appspecific/com.chrome.devtools.json`

NPM: Nuxt: Dev server discloses project absolute path and persistent workspace UUID via /.well-known/appspecific/com.chrome.devtools.json vulnerability discovered by ? in WordPress Npm nuxt versions = 4.0.0-alpha.1, 4.4.7...

Unintended Proxy or Intermediary ('Confused Deputy')

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 Unintended Proxy or Intermediary 'Confused Deputy' via permissive user proxy configurations that inclu...

@4399ywkf/core (>=5.0.0, <=5.0.32), @all-star/base (>=0.17.0, <=0.18.2) +323 more potentially affected by CVE-2026-9595 via webpack-dev-server (>=5.0.0, <=5.2.4)

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, =0.7.7, =1.0.5-beta.4, =1.0.1-beta.1, =0.18.3, =0.0.1, =0.3.2 and more Source cves: CVE-2026-9595 Source advisory:...

Unintended Proxy or Intermediary ('Confused Deputy')

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 Unintended Proxy or Intermediary 'Confused Deputy' via permissive user proxy...

CVE-2026-9595

Impact: When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

UBUNTU-CVE-2026-9595

Impact: When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

CVE-2026-9595 webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Impact: When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

CVE-2026-9595 webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies

Impact: When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

CVE-2026-9595

The CVE affects webpack-dev-server where a user-configured proxy with a broad context (e.g., /) and ws: true intercepts the dev server’s HMR WebSocket, forwarding it to the proxy target. This can leak cookies and Origin headers to the backend, bypass Host/Origin validation, and corrupt the HMR so...

CVE-2026-9595: Origin Validation Error

Impact: When a user-configured proxy on webpack-dev-server has a broad context e.g. / and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin...

PT-2026-52658

Summary When running nuxt dev, Nuxt registers an unauthenticated route at /.well-known/appspecific/com.chrome.devtools.json that returns the absolute filesystem path of the project root and a per-project UUID persisted to node modules/.cache/nuxt/chrome-workspace.json. The route is enabled by...