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CVE-2026-64643— Next.js: Unauthenticated Disclosure of Internal Server Function endpoints

Quick assessment

Affected
vercel next.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Next.js 是一个用于构建全栈 Web 应用的 React 框架。在 12.0.0 至 15.5.20 以及 16.0.0 至 16.2.10 版本中，使用了 App Router、Server Actions（即 “use server”）或使用 cache 端点的 Next.js 应用，可能导致这些端点通常在用页面中的认证机制被绕过。服务器操作（Server Action）的 ID 可能通过公开发布的客户端代码制品（例如包含操作引用的静态代码块）泄露给未认证用户。受影响的系统是使用了 App Router

CVSS 6.3 · Medium EPSS 0.51% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 13.0.0, < 15.5.21 affected
>= 16.0.0, < 16.2.11 affected
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I. Basic Information for CVE-2026-64643

Vulnerability Information
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Vulnerability Title
Next.js: Unauthenticated Disclosure of Internal Server Function endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Next.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, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions 15.5.21 and 16.2.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 13.0.0, < 15.5.21 -

II. Public POCs for CVE-2026-64643

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III. Intelligence Information for CVE-2026-64643

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Patches & Fixes for CVE-2026-64643 (1)

Vendor Advisories for CVE-2026-64643 (1)

Vendor Pages for CVE-2026-64643 (1)

Same Patch Batch · vercel · 2026-07-27 · 9 CVEs total

CVE-2026-64642 8.3 HIGH Next.js: Middleware / Proxy bypass in App Router applications using Turbopack and single l
CVE-2026-64645 8.3 HIGH Next.js: Server-Side Request Forgery in rewrites via attacker-controlled destination hostn
CVE-2026-64649 8.3 HIGH Next.js: Server-Side Request Forgery in Server Actions on Custom Servers
CVE-2026-64641 8.2 HIGH Next.js: Denial of Service in App Router using Server Actions
CVE-2026-64644 6.3 MEDIUM Next.js: Denial of Service in the Image Optimization API using SVGs
CVE-2026-64646 6.3 MEDIUM Next.js: Unbounded Server Action payload in Edge runtime
CVE-2026-64647 6.3 MEDIUM Next.js: Response Body Cache Confusion with Invalid UTF-8 Request Bodies
CVE-2026-64648 6.0 MEDIUM Next.js: Response Body Cache Confusion for Requests Containing Bodies

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-201