HTTP: Next.js Middleware Authorization Bypass

This signature detects attempts to exploit a known vulnerability against Next.js Middleware. A successful attack can lead to security bypass.

Extended Description

Next.js is a React framework for building full-stack web applications. Prior to 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 14.2.25 and 15.2.3.

References

CVE: CVE-2025-29927

Short Name

HTTP:CTS:NEXTJS-MIIDLWRE-AUTHB

Severity

Critical

Recommended

True

Recommended Action

Drop

HTTP: Next.js Middleware Authorization Bypass

Extended Description

References

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