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CVE-2025-29927

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 9.1 · Critical · EPSS 99.2% · Public exploit · Fix available

Published
Updated

Stack: node

Affected products and versions

  • next.js

    Versions
    • >= 11.1.4, < 12.3.5: Affected
    • >= 14.0.0, < 14.2.25: Affected
    • >= 15.0.0, < 15.2.3: Affected
    • >= 13.0.0, < 13.5.9: Affected

    No fix published

  • next npm

    Affected ranges
    • SEMVER: ≥ 13.0.0, < 13.5.9

    Update to 13.5.9

  • next npm

    Affected ranges
    • SEMVER: ≥ 14.0.0, < 14.2.25

    Update to 14.2.25

  • next npm

    Affected ranges
    • SEMVER: ≥ 15.0.0, < 15.2.3

    Update to 15.2.3

  • next npm

    Affected ranges
    • SEMVER: ≥ 12.0.0, < 12.3.5

    Update to 12.3.5

Original sources

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