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CVE-2026-44574

CVE-2026-44574 · Next.js: Middleware / Proxy bypass through dynamic route parameter injection

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. From 15.4.0 to before 15.5.16 and 16.2.5, applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially crafted query parameters can alter the dynamic route value seen by the page while leaving the visible path unchanged, which can allow protected content to be rendered without passing the expected middleware check. This vulnerability is fixed in 15.5.16 and 16.2.5.

CVSS 8.1 · High · EPSS 0.7% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • next.js

    Versions
    • >= 15.4.0, < 15.5.16: Affected
    • >= 16.0.0, < 16.2.5: Affected

    No fix published

  • next npm

    Affected ranges
    • SEMVER: ≥ 15.4.0, < 15.5.16

    Update to 15.5.16

  • next npm

    Affected ranges
    • SEMVER: ≥ 16.0.0, < 16.2.5

    Update to 16.2.5

Original sources

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