CVE-2024-51479: Vercel Next.js

High severity, CVSS 7.5. EPSS: 4% chance of exploitation in the next 30 days.

Next.js is a React framework for building full-stack web applications. In affected versions if a Next.js application is performing authorization in middleware based on pathname, it was possible for this authorization to be bypassed for pages directly under the application's root directory. For example: * [Not affected] `https://example.com/` * [Affected] `https://example.com/foo` * [Not affected] `https://example.com/foo/bar`. This issue is patched in Next.js `14.2.15` and later. If your Next.js application is hosted on Vercel, this vulnerability has been automatically mitigated, regardless of Next.js version. There are no official workarounds for this vulnerability.

Affected products

• Vercel Next.js: from 9.5.5, before 14.2.15 (fixed in 14.2.15)

Published 2024-12-17. Last modified 2026-06-17.