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CVE-2026-44580— Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input

CVSS 6.1 · Medium EPSS 0.01% · P2

Affected Version Matrix 2

VendorProductVersion RangeStatus
vercelnext.js>= 13.0.0, < 15.5.16affected
>= 16.0.0, < 16.2.5affected
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I. Basic Information for CVE-2026-44580

Vulnerability Information
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Vulnerability Title
Next.js: Cross-site scripting in beforeInteractive scripts with untrusted input
Source: NVD (National Vulnerability Database)
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 13.0.0 to before 15.5.16 and 16.2.5, applications that use beforeInteractive scripts together with untrusted content can be vulnerable to cross-site scripting. In affected versions, serialized script content was not escaped safely before being embedded into the document, which could allow attacker-controlled input to break out of the intended script context and execute arbitrary JavaScript in a visitor's browser. 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:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Next.js 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Next.js是Vercel开源的一个 React 框架。 Next.js 13.0.0至15.5.16之前版本和16.2.5之前版本存在跨站脚本漏洞，该漏洞源于使用beforeInteractive脚本与不受信任内容时，序列化脚本内容未安全转义即嵌入文档，可能导致跨站脚本攻击。
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

VendorProductAffected VersionsCPESubscribe
vercelnext.js >= 13.0.0, < 15.5.16 -

II. Public POCs for CVE-2026-44580

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III. Intelligence Information for CVE-2026-44580

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Advisory · 1

Same Patch Batch · vercel · 2026-05-13 · 13 CVEs total

CVE-2026-445788.6 HIGHNext.js: Server-side request forgery in applications using WebSocket upgrades
CVE-2026-445748.1 HIGHNext.js: Middleware / Proxy bypass through dynamic route parameter injection
CVE-2026-451097.5 HIGHNext.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-445797.5 HIGHNext.js: Denial of Service via connection exhaustion in applications using Cache Component
CVE-2026-445757.5 HIGHNext.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
CVE-2026-445737.5 HIGHNext.js: Middleware / Proxy bypass in Pages Router applications using i18n
CVE-2026-445775.9 MEDIUMNext.js: Denial of Service in the Image Optimization API
CVE-2026-444795.5 MEDIUMVercel: Non-interactive mode includes CLI arguments in suggested command output
CVE-2026-445765.4 MEDIUMNext.js: Cache poisoning in React Server Component responses
CVE-2026-445814.7 MEDIUMNext.js: Cross-site scripting in App Router applications using CSP nonces
CVE-2026-445723.7 LOWNext.js: Middleware / Proxy redirects can be cache-poisoned
CVE-2026-445823.7 LOWNext.js: Cache poisoning via collisions in React Server Component cache-busting

IV. Related Vulnerabilities

Same product: next.js
Same vendor: vercel
Same weakness: CWE-79

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