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fix: exact own origin for allowedOrigins lists, and open-editor over the network - #5776
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…the network With `allowedOrigins` set, the page's own origin is now the host and port it reached the server by, exactly, instead of its hostname on any port with the loopback names counted as one: another server's page on `localhost` could read the bundles through CORS and receive hot updates. `/webpack-dev-server/open-editor` reached through a network address now needs a same-origin `Referer` (or the hot token) when the request carries neither `Sec-Fetch-Site` nor `Origin`, which a browser omits for any `http:` page that is not on `localhost`. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UjuMAuk9o6UazjHzcAQCTA
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UjuMAuk9o6UazjHzcAQCTA
WalkthroughAllowed-origin checks now compare exact hosts and ports, with default-port normalization. The editor-opening endpoint now requires same-origin validation and evidence that the request came from the server’s page. Tests and documentation were updated for these rules. Priority: ➖ Normal Merge Risk: 🟡 Moderate · up to
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The title names both changes in the PR: exact own-origin matching for allowedOrigins lists, and restricting open-editor requests made over a network address. The raw summary and objectives confirm bot… |
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The title names both changes in the PR: exact own-origin matching for allowedOrigins lists, and restricting open-editor requests made over a network address. The raw summary and objectives confirm both are the main changes, so the title is specific and accurate. It is a single line, but it joins two topics with a comma and is somewhat long at 80 characters.
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Additional details and impacted files@@ Coverage Diff @@
## main #5776 +/- ##
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Coverage 95.80% 95.80%
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Files 6 6
Lines 5551 5608 +57
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+ Hits 5318 5373 +55
- Misses 233 235 +2 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UjuMAuk9o6UazjHzcAQCTA
🦋 Changeset detectedLatest commit: 38606e6 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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lib/Server.js
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| #isEditorRequestFromThisPage(req) { | ||
| const headers = | ||
| /** @type {{ [key: string]: string | undefined }} */ | ||
| (req.headers); | ||
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| // Already judged by `#isSameOriginRequest`. | ||
| if ( | ||
| typeof headers["sec-fetch-site"] === "string" || | ||
| typeof headers.origin === "string" | ||
| ) { | ||
| return true; | ||
| } | ||
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| const hostHeader = headers[":authority"] || headers.host; | ||
| const hostname = | ||
| typeof hostHeader === "string" | ||
| ? this.#parseHostnameFromHeader(hostHeader) | ||
| : null; | ||
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| if (hostname !== null && LOOPBACK_HOSTNAMES.has(hostname)) { | ||
| return true; | ||
| } | ||
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| const refererOrigin = this.#parseOrigin(headers.referer); | ||
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| return ( | ||
| (refererOrigin !== null && | ||
| this.#isListedOrSameOrigin(refererOrigin, headers)) || | ||
| this.#isHotTokenValid(req) | ||
| ); | ||
| } | ||
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🔒 Security & Privacy | 🟠 Major | ⚡ Quick win
🔎 Supported by static analysis
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🏁 Script executed:
sed -n '3810,3875p' lib/Server.js sed -n '202,285p' test/server/host-header-validation.test.js cat .changeset/open-editor-network-csrf.md
Repository: webpack/webpack-dev-server
Length of output: 5404
🏁 Script executed:
set -o pipefail printf '%s\n' '--- open-editor route and helper callers ---' sed -n '2228,2265p' lib/Server.js printf '%s\n' '--- same-origin request implementation ---' sed -n '3760,3825p' lib/Server.js printf '%s\n' '--- listed-origin and parser implementations ---' sed -n '3890,3985p' lib/Server.js printf '%s\n' '--- current helper ---' sed -n '3828,3872p' lib/Server.js printf '%s\n' '--- changed lines versus merge base ---' git diff --unified=35 8e6cf3a46ad12379e87e43779e1c7082ee0c194f 38606e6ed3bf33e7bc9ec6386b23b959305ba5ce -- lib/Server.js test/server/host-header-validation.test.js .changeset/open-editor-network-csrf.md
Repository: webpack/webpack-dev-server
Length of output: 27037
Require same-origin page proof for the open-editor endpoint.
An explicitly listed cross-origin page can send its normal Origin header and pass both checks. The helper accepts that Origin without a same-origin Referer or hot token. A listed cross-origin Referer also passes the helper.
allowedOrigins should authorize resource access, not prove that the request came from this server's page. Keep the hot token as the list-mode exception.
Suggested fix
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- if ( - typeof headers["sec-fetch-site"] === "string" || - typeof headers.origin === "string" - ) { + if ( + headers["sec-fetch-site"] === "same-origin" || + (typeof headers.origin === "string" && + this.#isListedOrSameOrigin(headers.origin, headers, false)) + ) { return true; } ... - this.#isListedOrSameOrigin(refererOrigin, headers)) || + this.#isListedOrSameOrigin(refererOrigin, headers, false)) || this.#isHotTokenValid(req)
- #isListedOrSameOrigin(originHeader, headers) { + #isListedOrSameOrigin(originHeader, headers, allowListed = true) { ... - if (allowedOrigins === "all") { + if (allowListed && allowedOrigins === "all") { return true; } ... - if (DEFAULT_ALLOWED_PROTOCOLS.test(originHeader)) { + if (allowListed && DEFAULT_ALLOWED_PROTOCOLS.test(originHeader)) { return true; } ... - if (Array.isArray(allowedOrigins) && allowedOrigins.includes(origin)) { + if ( + allowListed && + Array.isArray(allowedOrigins) && + allowedOrigins.includes(origin) + ) { return true; }
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Traced it, and the behavior is as described. A request that carries Origin was already judged by #isSameOriginRequest, which is #isOriginAllowed(headers, "endpoint") in list mode. So a page on a listed origin, or any origin with "all", can call /open-editor.
That is the rule #5770 set on purpose: listing an origin also opens the endpoints that act on the developer's machine to it. allowed-origins.test.js asserts this for invalidate ("opens the state-changing endpoints to the listed origin only").
Abusing it takes control of a page the developer chose to trust. That is narrower than the unlisted and network-address cases this PR closes.
Restricting /open-editor to the server's own page plus the token, as suggested, changes the meaning of allowedOrigins (currently unreleased). That's a call for the maintainer, so I'm leaving this open until they decide, rather than pushing it here.
Generated by Claude Code
I audited the security behavior of
mainafter #5770. The test drove a real browser against a dev server, with a hostile page on another loopback port and the server reached by a LAN address. It found two gaps; this PR closes both. The default setup onlocalhostbehaves exactly as before.1.
allowedOriginsas a list: the page's own origin is now exactWith a list, even
[], the page's own origin used to mean its hostname on any port, withlocalhost,127.0.0.1and[::1]counted as one. Explicit mode answers an allowed origin with an echoedAccess-Control-Allow-Origin. So any other server's page onlocalhostcould:/webpack-dev-serverassets page),It now means the host and port the request reached the server by, exactly. The scheme is not compared, so a proxy that terminates TLS in front of the server still counts. A pretend
Host(with a path or credentials) never matches.client.webSocketURLpoints elsewhere.allowedOriginsis not released yet (#5770). The release PR #5774 includes it, so please merge this one first.2.
/webpack-dev-server/open-editorreached through a network addressBrowsers send neither
Sec-Fetch-SitenorOriginfor a page that is not a secure context, which is anyhttp:page except one onlocalhost. With the server reached ashttp://192.168.x.x:8080(the defaulthostlistens on every interface), any page could load/webpack-dev-server/open-editor?fileName=/etc/hostnameas an image and launch the editor. The audit reproduced this in both"auto"and list modes.Such a request must now show where it came from:
Referer, which the overlay's ownfetchsends;Requests through
localhostare let in as before: browsers sendSec-Fetch-Sitethere, so a header-less request is a non-browser client.invalidateis unchanged (it only triggers a rebuild, and it is used by typing its URL).Not changed, already tracked in code TODOs (#5775)
"auto", a page on another loopback port can still connect to the HMR WebSocket. Real setups rely on this (a backend page on another port using HMR). The next major hands the token to every client and requires the exact origin.hostdefaults to every interface,serveIndexis on, andstatic.denyis off.Tests
Host.127.0.0.1are refused with no ACAO and no HMR; the page's own origin gets no credentials.Referer; allowed with its ownReferer,Sec-Fetch-Site: same-origin, or the token.mainalso has (IPv6, proxy, overlay snapshots), the only differences were the CLI help snapshots, updated here.harness-server-cleanuphangs in the sandbox onmainas well.localhostbehavior is unchanged.Generated by Claude Code
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Security
Documentation