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Vulnerabilities CVE-2026-44574

CVE-2026-44574

High
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
8.1
EPSS Score
0.62%

46.7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Confidence
90%
Published
May 13, 2026
Last Modified
Aug 13, 2026
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