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HIGH

Next.js: Middleware / Proxy bypass through dynamic route parameter injection

Published May 13, 2026

Description

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.

Affected products

Remediation

Red Hat statement

This is an Important authorization bypass flaw in Next.js applications, which are utilized in Red Hat AMQ, Red Hat Trusted Artifact Signer, and Red Hat Enterprise Linux AI. The vulnerability arises when applications use Next.js middleware to protect dynamic routes, allowing attackers to access restricted content by manipulating query parameters. This bypass occurs because specially crafted parameters can alter the route value seen by the page while the visible path remains unchanged, circumventing intended security controls.

Red Hat mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Weaknesses (2)

CWE-288

CWE-551

References (13)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner GitHub_M
Published May 13, 2026
Updated Aug 13, 2026
Reserved May 6, 2026
Link CVE-2026-44574
CISA Vulnrichment
Updated May 14, 2026
NVD
Status Modified
Modified Aug 13, 2026
Link CVE-2026-44574
Red Hat
Severity Important
Public date May 13, 2026
Links CVE-2026-44574 - Bugzilla
GHSA-492V-C6PP-MQQV