CVE-2026-44573— Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-44573
Vulnerability Information
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Vulnerability Title
Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
Source: NVD (National Vulnerability Database)
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized access to protected page data through locale-less /_next/data/<buildId>/<page>.json requests. In affected configurations, middleware does not run for the unprefixed data route, allowing an attacker to retrieve SSR JSON for protected pages without passing the intended authorization checks. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Next.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 12.2.0至15.5.16之前版本和16.2.5之前版本存在安全漏洞，该漏洞源于使用Pages Router且配置i18n和中间件或代理授权时，未对无语言前缀的/_next/data/<buildId>/<page>.json请求执行中间件，可能导致未经授权的访问受保护页面数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-44573
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Vendor Advisories for CVE-2026-44573 (1)
Same Patch Batch · vercel · 2026-05-13 · 13 CVEs total
| CVE-2026-44578 | 8.6 HIGH | Next.js: Server-side request forgery in applications using WebSocket upgrades |
| CVE-2026-44574 | 8.1 HIGH | Next.js: Middleware / Proxy bypass through dynamic route parameter injection |
| CVE-2026-45109 | 7.5 HIGH | Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes |
| CVE-2026-44579 | 7.5 HIGH | Next.js: Denial of Service via connection exhaustion in applications using Cache Component |
| CVE-2026-44575 | 7.5 HIGH | Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes |
| CVE-2026-44580 | 6.1 MEDIUM | Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input |
| CVE-2026-44577 | 5.9 MEDIUM | Next.js: Denial of Service in the Image Optimization API |
| CVE-2026-44479 | 5.5 MEDIUM | Vercel: Non-interactive mode includes CLI arguments in suggested command output |
| CVE-2026-44576 | 5.4 MEDIUM | Next.js: Cache poisoning in React Server Component responses |
| CVE-2026-44581 | 4.7 MEDIUM | Next.js: Cross-site scripting in App Router applications using CSP nonces |
| CVE-2026-44572 | 3.7 LOW | Next.js: Middleware / Proxy redirects can be cache-poisoned |
| CVE-2026-44582 | 3.7 LOW | Next.js: Cache poisoning via collisions in React Server Component cache-busting |
IV. Related Vulnerabilities
Same product: next.js
- CVE-2026-45109
Next.js: Middleware / Proxy bypass in App Router application - CVE-2026-44582
Next.js: Cache poisoning via collisions in React Server Comp - CVE-2026-44581
Next.js: Cross-site scripting in App Router applications usi - CVE-2026-44580
Next.js: Cross-site scripting in beforeInteractive scripts w - CVE-2026-44579
Next.js: Denial of Service via connection exhaustion in appl
Same vendor: vercel
- CVE-2026-8769
vercel ai provider-utils response-handler.ts createJsonError - CVE-2026-8768
vercel ai provider-utils download-blob.ts validateDownloadUr - CVE-2026-8767
vercel ai PR Branch Name Interpolation prettier-on-automerge - CVE-2026-45773
Turborepo: Login callback CSRF/session fixation - CVE-2026-46508
Turborepo: VSCode Extension command injection
Same weakness: CWE-863
- CVE-2018-25353
Redaxo CMS Mediapool Addon 5.5.1 Arbitrary File Upload - CVE-2026-6406
Docker Desktop Enhanced Container Isolation bypass via --use - CVE-2026-39966
TypeBot: Async filter() bypasses authorization, allowing IDO - CVE-2026-28735
GitHub OAuth Scope Validation - CVE-2026-47102
LiteLLM < 1.83.10 Privilege Escalation via User Update
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