Critical Next.js Vulnerability Allows Attackers to Bypass Middleware Authorization Checks

A critical security flaw has been disclosed in the Next.js React framework that could be potentially exploited to bypass authorization checks under certain conditions. The vulnerability, tracked as CVE-2025-29927 , carries a CVSS score of 9.1 out of 10.0. "Next.js uses an internal header...

Detecting and Mitigating an Authorization Bypass Vulnerability in Next.js

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Next.js 15.x < 15.2.3 Authorization Bypass

The version of Next.js installed on the remote host is 11.1.4 prior to 12.3.5, 13.0.x prior to 13.5.9, 14.x prior to 14.2.25 or 15.x prior to 15.2.3. It is, therefore, affected by Authorization Bypass if the authorization check occurs in middleware. Note that the scanner has not attempted to...

Next.js 14.x < 14.2.25 Authorization Bypass

The version of Next.js installed on the remote host is 11.1.4 prior to 12.3.5, 13.0.x prior to 13.5.9, 14.x prior to 14.2.25 or 15.x prior to 15.2.3. It is, therefore, affected by Authorization Bypass if the authorization check occurs in middleware. Note that the scanner has not attempted to...

Next.js 13.0.x < 13.5.9 Authorization Bypass

The version of Next.js installed on the remote host is 11.1.4 prior to 12.3.5, 13.0.x prior to 13.5.9, 14.x prior to 14.2.25 or 15.x prior to 15.2.3. It is, therefore, affected by Authorization Bypass if the authorization check occurs in middleware. Note that the scanner has not attempted to...

Exploit for CVE-2025-29927

CVE-2025-29927-PoC-Exploit Proof-of-Concept for Authorization...

Exploit for CVE-2025-29927

CVE-2025-29927-PoC-Exploit Proof-of-Concept for Authorization...

Exploit for CVE-2025-29927

Scanner de Vulnerabilidade Middleware Subrequest do Next.js U...

CVE-2025-29927

A flaw was found in Next.js package. This vulnerability allows bypassing authorization checks within a Next.js application if the authorization check occurs in middleware. Mitigation Block or drop external user requests which contain the x-middleware-subrequest header from reaching your Next.js...

Exploit for CVE-2025-29927

Next.js POC for CVE-2025-29927 - Authorization Bypass in Ne...

Exploit for CVE-2025-29927

nextjs-CVE-2025-29927 A Nuclei template to detect CVE-2025-299...

Exploit for CVE-2025-29927

CVE-2025-29927 Next.js Middleware Authorization Bypass T...

Authorization Bypass in Next.js Middleware

Impact It is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. Patches For Next.js 15.x, this issue is fixed in 15.2.3 For Next.js 14.x, this issue is fixed in 14.2.25 For Next.js 13.x, this issue is fixed in 13.5.9 For Next.js...

CVE-2025-29927

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 ...

CVE-2025-29927 Authorization Bypass in Next.js Middleware

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 ...

CVE-2025-29927

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 ...

CVE-2025-29927 Authorization Bypass in Next.js Middleware

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 ...

CVE-2025-29927 Authorization Bypass in Next.js Middleware

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 ...

CVE-2025-29927

CVE‑2025‑29927 affects Next.js before patches: versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3. The issue is an authorization bypass that can occur if the check runs in middleware. Fixed in the specified versions; patching to a safe version is recommended. If patching is infeasible, block external r...

PT-2025-12427

Name of the Vulnerable Software and Affected Versions Next.js versions 1.11.4 through 12.3.4 Next.js versions 13.x through 13.5.8 Next.js versions 14.x through 14.2.24 Next.js versions 15.x through 15.2.2 Description An authorization bypass exists in the Next.js framework due to the improper...