CVE-2026-27978 Next.js: null origin can bypass Server Actions 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, 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...

CVE-2026-27978

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, "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...

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...

CVE-2026-27977

CVE-2026-27977 affects the Next.js development server. The vulnerability lies in the Next.js dev mode where cross-site protection for internal HMR websocket endpoints could treat Origin: null as a permitted bypass even when allowedDevOrigins is configured, allowing privacy-sensitive contexts (e.g...

CVE-2026-27977

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-2026-12704

Next.js: HTTP request smuggling in rewrites...

EUVD-2026-12694

Next.js: Unbounded next/image disk cache growth can exhaust storage...

GHSA-H27X-G6W4-24GQ Next.js: Unbounded postponed resume buffering can lead to DoS

Summary A request containing the next-resume: 1 header corresponding with a PPR resume request would buffer request bodies without consistently enforcing maxPostponedStateSize in certain setups. The previous mitigation protected minimal-mode deployments, but equivalent non-minimal deployments...

EUVD-2026-12692

Next.js: Unbounded postponed resume buffering can lead to DoS...

Allocation of Resources Without Limits or Throttling

Overview next is a react framework. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling due to the unbounded postponed resume-body buffering behavior of the next-resume: 1 header. An attacker can cause excessive memory usage and disrupt service...

EUVD-2026-12684

Next.js: null origin can bypass Server Actions CSRF checks...

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...

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...

Exploit for Incorrect Authorization in Vercel Next.Js

CVE-2025-29927 — Next.js Middleware Authentication Bypass...

Next.js security vulnerabilities

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 security vulnerabilities

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,...