CVE-2025-29927 Scanner
CVE-2025-29927 Scanner - Authorization Bypass vulnerability in Next.js X Middleware Subrequest
Used 3.4k times · 5.9k assets checked · url
CVE
CVE-2025-29927
9.1
CVSScritical
Exploitable remotely over the internet · no authentication required.
Description
Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.
Attack Vector
Network
Privileges Req.
None
User Interaction
None
next.js
Updated Sep 28, 2026View on NVD →
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CVE history: next.js
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