tag
App-Router
Next.js RSC Server-Action DoS via Flight Deserialization (CVE-2026-23870)
CVE-2026-23870 is a pre-authentication Denial of Service against any Next.js deployment using the App Router. An attacker sends crafted HTTP POST requests to any App Router server function endpoint with a deeply-cyclic or wide fan-out React Flight protocol…
Next.js Dynamic Route Injection Auth Bypass (CVE-2026-44574)
CVE-2026-44574 is an authentication bypass in Next.js App Router applications that use middleware to protect dynamic route pages. Specially crafted query parameters (nxtP / nxtI internal Next.js route params) injected on a public URL cause the App Router…
Next.js CSP Nonce Cache-Poisoned XSS (CVE-2026-44581)
CVE-2026-44581 is a reflected XSS issue in Next.js App Router nonce handling. Malformed nonce values from a Content-Security-Policy request header can be reflected into rendered HTML script attributes without safe attribute-context escaping. In caching…
Next.js beforeInteractive Script XSS (CVE-2026-44580)
CVE-2026-44580 is an XSS vulnerability in Next.js next/script rendering for beforeInteractive scripts. Vulnerable versions serialize script props with JSON.stringify and inject them into inline HTML via dangerouslySetInnerHTML without safe HTML escaping for…
Next.js App Router Segment-Prefetch Middleware Bypass (CVE-2026-44575)
CVE-2026-44575 is an authorization bypass in Next.js App Router middleware matching. Vulnerable versions compile middleware matchers for canonical paths and legacy Pages Router data routes, but omit the App Router transport variants used for .rsc and…