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.
History

Wed, 03 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-551
References
Metrics threat_severity

None

threat_severity

Important


Thu, 14 May 2026 12:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*

Thu, 14 May 2026 11:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 13 May 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Vercel
Vercel next.js
Vendors & Products Vercel
Vercel next.js

Wed, 13 May 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Title Next.js: Middleware / Proxy bypass through dynamic route parameter injection
Weaknesses CWE-288
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T10:30:11.611Z

Reserved: 2026-05-06T21:49:12.424Z

Link: CVE-2026-44574

cve-icon Vulnrichment

Updated: 2026-05-14T10:30:08.565Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-13T17:16:22.767

Modified: 2026-05-14T12:37:00.523

Link: CVE-2026-44574

cve-icon Redhat

Severity : Important

Publid Date: 2026-05-13T16:56:06Z

Links: CVE-2026-44574 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-03T14:00:21Z