CVE-2026-44574
Next.js: Middleware / Proxy bypass through dynamic route parameter injection
- Published
- May 13, 2026
- Updated
- Aug 13, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NLow · next 30 days
- Percentile
- 48.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Next.js v16.2.4 Security PoC Collection (CVE-2026-23870, CVE-2026-44575, CVE-2026-44579, CVE-2026-44574, CVE-2026-44578, CVE-2026-44573, CVE-2026-44581, CVE-2026-44580, CVE-2026-44577, CVE-2026-44576, CVE-2026-44582, CVE-2026-44572)
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.