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...

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...

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...

Cross-site Request Forgery (CSRF)

Overview next is a react framework. Affected versions of this package are vulnerable to Cross-site Request Forgery CSRF due to the uncaught origin: null in the Server Action CSRF validation. An attacker can perform unauthorized state-changing actions on behalf of a user by inducing the user's...

GHSA-MQ59-M269-XVCX Next.js: null origin can bypass Server Actions CSRF checks

Summary origin: null was treated as a "missing" origin during Server Action CSRF validation. As a result, requests from opaque contexts such as sandboxed iframes could bypass origin verification instead of being validated as cross-origin requests. Impact An attacker could induce a victim browser ...

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...

GHSA-JCC7-9WPM-MJ36 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...

PT-2026-25908

Name of the Vulnerable Software and Affected Versions Next.js versions 16.0.1 through 16.1.6 Description Next.js, a React framework for building full-stack web applications, had a flaw in its development mode next dev where cross-site protection for internal websocket endpoints could incorrectly...

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 treating origin: null as an absent source during server-side CSRF validation, which could lead to bypassing source verification and triggerin...

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-2026-25909

Name of the Vulnerable Software and Affected Versions Next.js versions 16.0.1 through 16.1.7 Description Next.js, a React framework for building full-stack web applications, had a flaw in its Server Action CSRF validation. Specifically, origin: null was incorrectly treated as a missing origin,...

Origin Null Vulnerability

rack-cors is vulnerable to an origin null vulnerability. When an iframe contains html code for its source instead of a URL, a website using rack-cors and allowing file:// does not prevent browsers to send null origins...