AIKIDO-2026-472610
next is vulnerable to Authorization Bypass
83
High Risk
This Affects:
nextTL;DR
Next.js applications using the App Router built with Turbopack and a single entry in config.i18n.locales mishandle path normalization for locale-prefixed routes. A crafted request can reach a protected route in a form that middleware does not match, so middleware- or proxy-based authentication checks are skipped. This lets an unauthenticated caller bypass authorization and access protected pages. The fix corrects locale route handling so middleware runs for the affected requests.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application uses the App Router built with Turbopack and a single entry in config.i18n.locales.
Background info
next is vulnerable to Authorization Bypass in versions 16.0.0 - 16.2.10.
How to fix this
Upgrade the next library to the patch version.
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SOC 2Compliant
ISO 27001Compliant