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Vulnerability record · CVE-2026-64642 · published 27 July 2026

CVE-2026-64642: Vercel next.js improper authorization vulnerability

Vercel · Next.Js

Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.

8.3 CVSS 4.0 High EPSS 0.64% · top 51.6% CWE-285 · Improper authorization
8.3CVSS 4.0 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
29 Jul 2026Last modified by NVD

Description

Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/vercel/next.js/commit/6bf4df14508ad6c0cd46af50c6051ee42f2d9151 Patch
https://github.com/vercel/next.js/pull/96014 Issue TrackingPatch
https://github.com/vercel/next.js/releases/tag/v16.2.11 ProductRelease Notes
https://github.com/vercel/next.js/security/advisories/GHSA-6gpp-xcg3-4w24 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2025-55182React Server Components pre-auth deserialization RCEReact Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 (react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack) u…KEVEPSS 100%analysed9.1CVE-2025-29927Next.js middleware authorization bypass via x-middleware-subrequest headerNext.js versions from 1.11.4 up to (but not including) 12.3.5, 13.5.9, 14.2.25, and 15.2.3 allow authorization checks performed in middleware to be b…EPSS 99%analysed8.6CVE-2026-44578Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the …EPSS 1.9%8.3CVE-2026-64649Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 14.1.1 through 15.5.20 and 16.0.0 through 16.2.10, when a Server A…EPSS 0.46%8.3CVE-2026-64645Vercel next.js open redirect vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a rewrites() or…EPSS 0.41%8.2CVE-2026-64641Vercel next.js vulnerabilityNext.js is a React framework for building full-stack web applications. In versions 13.0.0 through 15.5.20 and 16.0.0 through 16.2.10, crafted request…EPSS 0.86%8.2CVE-2025-57822Vercel next.js server-side request forgery (ssrf) vulnerabilityNext.js is a React framework for building full-stack web applications. Prior to versions 14.2.32 and 15.4.7, when next() was used without explicitly …EPSS 2.5%8.1CVE-2026-44574Vercel next.js authentication bypass via alternate path vulnerabilityNext.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…EPSS 0.67%

Source: NIST National Vulnerability Database (record CVE-2026-64642), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.