[Renovate] Update dependency webpack-dev-server to v6 [SECURITY]#9
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This PR contains the following updates:
^1.10.1→^6.0.0Missing Origin Validation in webpack-dev-server
CVE-2018-14732 / GHSA-cf66-xwfp-gvc4
More information
Details
Versions of
webpack-dev-serverbefore 3.1.10 are missing origin validation on the websocket server. This vulnerability allows a remote attacker to steal a developer's source code because the origin of requests to the websocket server that is used for Hot Module Replacement (HMR) are not validated.Recommendation
For
webpack-dev-serverupdate to version 3.1.11 or later.Severity
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
webpack-dev-server users' source code may be stolen when they access a malicious web site
CVE-2025-30359 / GHSA-4v9v-hfq4-rm2v
More information
Details
Summary
Source code may be stolen when you access a malicious web site.
Details
Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject
<script src="http://localhost:8080/main.js">in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. Combined with prototype pollution, the attacker can get a reference to the webpack runtime variables.By using
Function::toStringagainst the values in__webpack_modules__, the attacker can get the source code.PoC
npm inpx webpack-dev-serverhttps://e29c9a88-a242-4fb4-9e64-b24c9d29b35b.pages.dev/The script in the POC site is:
This script uses the function generated by
renderRequire.Especially, it uses the fact that
Array::forEachis called for__webpack_require__.iandexecOptionscontains__webpack_require__.It uses prototype pollution against
Array::forEachto extract__webpack_require__reference.Impact
This vulnerability can result in the source code to be stolen for users that uses a predictable port and output path for the entrypoint script.
Old content
Summary
Source code may be stolen when you use
output.iife: falseand access a malicious web site.Details
When
output.iife: falseis set, some global variables for the webpack runtime are declared on thewindowobject (e.g.__webpack_modules__).Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject
<script src="http://localhost:8080/main.js">in their site and run the script. Note that the attacker has to know the port and the output entrypoint script path. By running that, the webpack runtime variables will be declared on thewindowobject.By using
Function::toStringagainst the values in__webpack_modules__, the attacker can get the source code.I pointed out
output.iife: false, but if there are other options that makes the webpack runtime variables to be declared on thewindowobject, the same will apply for those cases.PoC
npm inpx webpack-dev-serverhttps://852aafa3-5f83-44da-9fc6-ea116d0e3035.pages.dev/src/index.jsand other scripts loaded.The script in the POC site is:
Impact
This vulnerability can result in the source code to be stolen for users that has
output.iife: falseoption set and uses a predictable port and output path for the entrypoint script.Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser
CVE-2025-30360 / GHSA-9jgg-88mc-972h
More information
Details
Summary
Source code may be stolen when you access a malicious web site with non-Chromium based browser.
Details
The
Originheader is checked to prevent Cross-site WebSocket hijacking from happening which was reported by CVE-2018-14732.But webpack-dev-server always allows IP address
Originheaders.https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127
This allows websites that are served on IP addresses to connect WebSocket.
By using the same method described in the article linked from CVE-2018-14732, the attacker get the source code.
related commit: webpack/webpack-dev-server@72efaab (note that
checkHostfunction was only used for Host header to prevent DNS rebinding attacks so this change itself is fine.This vulnerability does not affect Chrome 94+ (and other Chromium based browsers) users due to the non-HTTPS private access blocking feature.
PoC
npm inpx webpack-dev-serverhttp://{ipaddress}/?target=http://localhost:8080&file=mainwith a non-Chromium browser (I used Firefox 134.0.1)src/index.jsin the extracted directorysrc/index.jsThe script in the POC site is:
Impact
This vulnerability can result in the source code to be stolen for users that uses a predictable port and uses a non-Chromium based browser.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
webpack-dev-server vulnerable to cross-origin source code exposure on non-HTTPS origins
CVE-2026-6402 / GHSA-79cf-xcqc-c78w
More information
Details
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 onSec-Fetch-ModeandSec-Fetch-Siterequest headers to block these requests, but browsers only send these headers for potentially trustworthy origins. 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.
Patches
Patched in webpack-dev-server >= 5.2.4 by setting
Cross-Origin-Resource-Policy: same-originon responses.Workarounds
Run the dev server with HTTPS enabled (
--httpsorserver.type: 'https'in config).Resources
Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
webpack-dev-server vulnerable to HMR WebSocket interception via permissive user proxies
CVE-2026-9595 / GHSA-mx8g-39q3-5c79
More information
Details
Impact
When a user-configured proxy on
webpack-dev-serverhas a broad context (e.g./) andws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies andOriginheader to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket).Patches
Fixed in
webpack-dev-server5.2.5.Workarounds
Scope user-defined proxy
contextto specific paths instead of/, or omitws: truefrom the proxy entry when WebSocket forwarding is not required.Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
webpack/webpack-dev-server (webpack-dev-server)
v6.0.0Compare Source
Major Changes
Bump Express to v5. See the Express 5 migration guide for the full list of breaking changes. (by @bjohansebas in #5674)
Bump the
webpackpeer dependency range from^5.0.0to^5.101.0. (by @bjohansebas in #5674)Drop support for Node.js < 22.15.0. (by @bjohansebas in #5674)
Convert the source to native ES modules. The package keeps
"type": "module"and now exposes both an ESM and a CommonJS build via theexportsfield: ESM consumersimportthe nativelib/, while CommonJS consumersrequire()a transpileddist/build — so the package works from both ESM and CommonJS, including environments whererequire(ESM)is not supported. (by @bjohansebas in #5674)Remove CLI flags. Use the
servecommand fromwebpack-clitogether with a configuration file or the programmatic API instead. (by @bjohansebas in #5674)Remove the
internalIPandinternalIPSyncstatic methods fromServer. Resolve the local IP yourself if you need it. (by @bjohansebas in #5674)Remove the
bypassoption from proxy configuration. Use therouterorcontextoptions provided byhttp-proxy-middlewareinstead. (by @bjohansebas in #5674)Remove SockJS support. The
webSocketServeroption no longer accepts"sockjs"; use the default"ws"transport instead. (by @bjohansebas in #5674)Remove the
spdydependency. Use the built-innode:http2module via theserveroption for HTTP/2 support. (by @bjohansebas in #5674)Update
http-proxy-middlewareto v4. See the http-proxy-middleware v3 release notes and v4 release notes for the full list of breaking changes. (by @bjohansebas in #5674)Update
webpack-dev-middlewareto v8 and syncoriginalUrlfor middleware compatibility.server.middleware.getFilenameFromUrl()is now asynchronous and resolves to{ filename, extra: { stats, outputFileSystem } }. See the webpack-dev-middleware v8 release notes for details. (by @bjohansebas in #5674)Minor Changes
Add plugin support.
webpack-dev-servercan now be used as a webpack plugin, integrating with the compiler lifecycle without explicitly passing a compiler, preventing multiple server starts on recompilation, ensuring clean shutdown, and supportingMultiCompilersetups with multiple independent plugin servers. (by @bjohansebas in #5674)Enable the compression middleware for HTTP/2 connections. (by @bjohansebas in #5674)
Remove the
colorettedependency in favor of native ANSI styling. (by @bjohansebas in #5674)Update
chokidarto v5 and extendwatchFiles.options.ignoredto support glob string patterns viatinyglobby. (by @bjohansebas in #5674)Use
compiler.platformto determine the target environment instead of inspecting the resolvedtargetstring. Universal targets ("universal"or["web", "node"], wherecompiler.platform.universalistruesince webpack5.108.0) are treated as web targets so the client runtime is injected. (by @bjohansebas in #5674)Use the WHATWG
URLAPI instead of the deprecatedurl.parse. (by @bjohansebas in #5674)Patch Changes
Bump production dependencies, notably
opento v11 andp-retryto v8. (by @bjohansebas in #5674)Reject cross-site requests to the internal
open-editorandinvalidateendpoints. They performed state-changing actions (opening a file in the editor, forcing a recompilation) on any GET request, so a page the developer visited could trigger them. They now require a same-origin request, validated viaSec-Fetch-Sitewith anOrigin/Hostfallback. (by @bjohansebas in #5691)Treat loopback aliases (
127.0.0.1,::1,localhost) as equivalent inisSameOriginso the WebSocket client does not reject valid same-origin connections. (by @bjohansebas in #5674)Migrate the test suite from Jest to
node:testand set up the jsdom environment. (by @bjohansebas in #5674)Update
webpack-clito v7.0.2. (by @bjohansebas in #5674)v5.2.6Compare Source
Patch Changes
fix: allow
undefinedas theServerconstructoroptionsargument again (by @bjohansebas in #5695)Restores accepting
undefined(defaulting it to{}) for theoptionsargument, so passing a webpack config's optional
devServerfield type-checks and works as before.Protect the built-in state-changing routes (
/webpack-dev-server/invalidateand/webpack-dev-server/open-editor) against cross-site request forgery. Requests are now checked withSec-Fetch-Site(falling back to anOrigin/Hostcomparison when it is absent), so a cross-site page can no longer trigger a rebuild or open a file in the editor. Same-origin requests, user-initiated navigations, and non-browser clients (e.g. curl) are unaffected. (by @bjohansebas in #5698)Handle malformed
HostandOriginheader values gracefully when validating requests. (by @bjohansebas in #5699)v5.2.5Compare Source
Patch Changes
All notable changes to this project will be documented in this file. See standard-version for commit guidelines.
5.2.4 (2026-05-11)
Bug Fixes
5.2.3 (2026-01-12)
Bug Fixes
causeforerrorObject(#5518) (37b033d)5.2.2 (2025-06-03)
Bug Fixes
X_TEST(#5451) (64a6124)allowedHostsoption for cross-origin header check (#5510) (03d1214)v5.2.4Compare Source
v5.2.3Compare Source
v5.2.2Compare Source
v5.2.1Compare Source
Security
Access-Control-Allow-OriginheaderOriginheader are not allowed to connect to WebSocket server unless configured byallowedHostsor it different from theHostheaderThe above changes may make the dev server not work if you relied on such behavior, but unfortunately they carry security risks, so they were considered as fixes.
Bug Fixes
v5.2.0Compare Source
Features
getClientEntryandgetClientHotEntrymethods to get clients entries (dc642a8)Bug Fixes
v5.1.0Compare Source
Features
appoption to beFunction(by default only withconnectcompatibility frameworks) (3096148)serveroption to beFunction(#5275) (02a1c6d)connectandconnectcompatibility frameworks which support HTTP2 (#5267) (6509a3f)Bug Fixes
platformproperty to determinate the target (#5269) (c3b532c)rimrafwithrm(#5162) (1a1561f)devServer: false(#5272) (8b341cb)5.0.4 (2024-03-19)
Bug Fixes
5.0.3 (2024-03-12)
Bug Fixes
5.0.2 (2024-02-16)
Bug Fixes
5.0.1 (2024-02-13)
Bug Fixes
require-trusted-types-for(#5046) (e115436)v5.0.4Compare Source
Security
Access-Control-Allow-OriginheaderOriginheader are not allowed to connect to WebSocket server unless configured byallowedHostsor it different from theHostheaderThe above changes may make the dev server not work if you relied on such behavior, but unfortunately they carry security risks, so they were considered as fixes.
Bug Fixes
v5.0.3Compare Source
Features
appoption to beFunction(by default only withconnectcompatibility frameworks) (3096148)serveroption to beFunction(#5275) (02a1c6d)connectandconnectcompatibility frameworks which support HTTP2 (#5267) (6509a3f)Bug Fixes
platformproperty to determinate the target (#5269) (c3b532c)rimrafwithrm(#5162) (1a1561f)devServer: false(#5272) (8b341cb)5.0.4 (2024-03-19)
Bug Fixes
5.0.3 (2024-03-12)
Bug Fixes
5.0.2 (2024-02-16)
Bug Fixes
5.0.1 (2024-02-13)
Bug Fixes
require-trusted-types-for(#5046) (e115436)v5.0.2Compare Source
Features
appoption to beFunction(by default only withconnectcompatibility frameworks) (3096148)serveroption to beFunction(#5275) (02a1c6d)connectandconnectcompatibility frameworks which support HTTP2 (#5267) (6509a3f)Bug Fixes
platformproperty to determinate the target (#5269) (c3b532c)rimrafwithrm(#5162) (1a1561f)devServer: false(#5272) (8b341cb)5.0.4 (2024-03-19)
Bug Fixes
5.0.3 (2024-03-12)
Bug Fixes
5.0.2 (2024-02-16)
Bug Fixes
5.0.1 (2024-02-13)
Bug Fixes
require-trusted-types-for(#5046) (e115436)v5.0.1Compare Source
Features
appoption to beFunction(by default only withconnectcompatibility frameworks) (3096148)serveroption to beFunction(#5275) (02a1c6d)connectandconnectcompatibility frameworks which support HTTP2 (#5267) (6509a3f)Bug Fixes
platformproperty to determinate the target (#5269) (c3b532c)rimrafwithrm(#5162) (1a1561f)devServer: false(#5272) (8b341cb)5.0.4 (2024-03-19)
Bug Fixes
5.0.3 (2024-03-12)
Bug Fixes
5.0.2 (2024-02-16)
Bug Fixes
5.0.1 (2024-02-13)
Bug Fixes
require-trusted-types-for(#5046) (e115436)v5.0.0Compare Source
Features
appoption to beFunction(by default only withconnectcompatibility frameworks) (3096148)serveroption to beFunction(#5275) (02a1c6d)connectandconnectcompatibility frameworks which support HTTP2 (#5267) (6509a3f)Bug Fixes
platformproperty to determinate the target (#5269) (c3b532c)rimrafwithrm(#5162) (1a1561f)devServer: false(#5272) (8b341cb)5.0.4 (2024-03-19)
Bug Fixes
5.0.3 (2024-03-12)
Bug Fixes
5.0.2 (2024-02-16)
Bug Fixes
5.0.1 (2024-02-13)
Bug Fixes
require-trusted-types-for(#5046) (e115436)v4.15.2Compare Source
4.15.2 (2024-03-20)
Bug Fixes
v4.15.1Compare Source
Migration Guide and Changes.
4.15.1 (2023-06-09)
Bug Fixes
::withlocalhostbefore openBrowser() (#4856) (874c44b)@types/ws(#4899) (34bcec2)v4.15.0Compare Source
Migration Guide and Changes.
4.15.1 (2023-06-09)
Bug Fixes
::withlocalhostbefore openBrowser() (#4856) (874c44b)Configuration
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