CVE-2026-27977

A CSRF check bypass flaw has been discovered in Next.js. In the next dev, cross-site protection for internal websocket endpoints could treat Origin: null as a bypass case even if allowedDevOrigins is configured, allowing privacy-sensitive/opaque contexts for example sandboxed documents to connect...

CVE-2026-27977 Next.js: null origin can bypass dev HMR websocket CSRF checks

Next.js is a React framework for building full-stack web applications. Starting in version 16.0.1 and prior to version 16.1.7, in next dev, cross-site protection for internal websocket endpoints could treat Origin: null as a bypass case even if allowedDevOrigins is configured, allowing...

EUVD-2026-12683

Next.js: null origin can bypass dev HMR websocket CSRF checks...

Next.js: null origin can bypass dev HMR websocket CSRF checks

Summary In next dev, cross-site protections for internal development endpoints could treat Origin: null as a bypass case even when allowedDevOrigins is configured. This could allow privacy-sensitive or opaque browser contexts, such as sandboxed documents, to access privileged internal dev-server...

Next.js 安全漏洞

Next.js is a React framework open source by Vercel. Versions of Next.js from 16.0.1 to 16.1.7 had a security vulnerability. This vulnerability stemmed from the cross-site protection of the internal WebSocket endpoint in development mode, which might treat Origin: null as an mechanism. This could...

PT-2026-25908

Summary In next dev, cross-site protection for internal websocket endpoints could treat Origin: null as a bypass case even if allowedDevOrigins is configured, allowing privacy-sensitive/opaque contexts for example sandboxed documents to connect unexpectedly. Impact If a dev server is reachable fr...

GHSA-77Q4-M83Q-W76V Missing Origin Validation in browserify-hmr

Versions of browserify-hmr prior to 0.4.0 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...

Missing Origin Validation in browserify-hmr

Versions of browserify-hmr prior to 0.4.0 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...

GHSA-CF66-XWFP-GVC4 Missing Origin Validation in webpack-dev-server

Versions of webpack-dev-server before 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...

Missing Origin Validation in webpack-dev-server

Versions of webpack-dev-server before 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...

GHSA-37Q6-576Q-VGR7 Missing Origin Validation in parcel-bundler

Versions of parcel-bundler before 1.10.0 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...

CVE-2018-14732

An issue was discovered in lib/Server.js in webpack-dev-server before 3.1.6. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR Hot Module Replacement. Anyone can receive the HMR message sent by the WebSocket...

CVE-2018-14731

An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR Hot Module Replacement. Anyone can receive the HMR message sent by the WebSocket server via a...

Code injection

An issue was discovered in Browserify-HMR. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR Hot Module Replacement. Anyone can receive the HMR message sent by the WebSocket server via a ws://127.0.0.1:3123/...

Code injection

An issue was discovered in HMRServer.js in Parcel parcel-bundler. Attackers are able to steal developer's code because the origin of requests is not checked by the WebSocket server, which is used for HMR Hot Module Replacement. Anyone can receive the HMR message sent by the WebSocket server via a...

PT-2018-12689 · Webpack · Webpack-Dev-Server

Name of the Vulnerable Software and Affected Versions: webpack-dev-server versions prior to 3.1.10 webpack-dev-server versions prior to 3.1.6 Description: An issue in the WebSocket server used for Hot Module Replacement HMR allows attackers to steal a developer's source code because the origin of...