CVE-2026-64642: CWE-285: Improper Authorization in 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.
AI Analysis
Technical Summary
CVE-2026-64642 is an improper authorization vulnerability in the Next.js React framework affecting versions 16.0.0 up to but not including 16.2.11. The flaw allows attackers to bypass authentication middleware or proxy protections by sending specially crafted requests targeting applications using the App Router built with Turbopack and configured with a single locale in config.i18n.locales. This could lead to unauthorized access to protected resources. The vulnerability has been addressed in Next.js version 16.2.11.
Potential Impact
Successful exploitation allows an attacker to bypass authentication mechanisms in affected Next.js applications, potentially granting unauthorized access to protected resources. This could compromise application security and data confidentiality depending on the application's authorization model.
Mitigation Recommendations
Upgrade Next.js to version 16.2.11 or later, where this vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory indicating the fix in 16.2.11.
CVE-2026-64642: CWE-285: Improper Authorization in vercel next.js
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 v4.0
Score 8.3high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-64642 is an improper authorization vulnerability in the Next.js React framework affecting versions 16.0.0 up to but not including 16.2.11. The flaw allows attackers to bypass authentication middleware or proxy protections by sending specially crafted requests targeting applications using the App Router built with Turbopack and configured with a single locale in config.i18n.locales. This could lead to unauthorized access to protected resources. The vulnerability has been addressed in Next.js version 16.2.11.
Potential Impact
Successful exploitation allows an attacker to bypass authentication mechanisms in affected Next.js applications, potentially granting unauthorized access to protected resources. This could compromise application security and data confidentiality depending on the application's authorization model.
Mitigation Recommendations
Upgrade Next.js to version 16.2.11 or later, where this vulnerability is fixed. No other mitigations are specified. Patch status is confirmed by the vendor advisory indicating the fix in 16.2.11.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-6gpp-xcg3-4w24
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64642"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a616bcd9c2644c7f80dbdb9
Added to database: 07/23/2026, 01:18:05 UTC
Last enriched: 07/30/2026, 15:28:52 UTC
Last updated: 09/05/2026, 10:52:11 UTC
Views: 286
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