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CVE-2026-44581— Next.js: Cross-site scripting in App Router applications using CSP nonces

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Vercel开源的一个 React 框架。 Next.js 13.4.0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App Router应用依赖CSP nonce时，格式错误的nonce值从请求头派生并反射到渲染HTML中，可能导致存储型跨站脚本攻击。

CVSS 4.7 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
vercel next.js >= 13.4.0, < 15.5.16 affected
>= 16.0.0, < 16.2.5 affected
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I. Basic Information for CVE-2026-44581

Vulnerability Information
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Vulnerability Title
Next.js: Cross-site scripting in App Router applications using CSP nonces
Source: CVE Program / CVE List V5
Vulnerability Description
Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution for later visitors. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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 13.4.0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App Router应用依赖CSP nonce时，格式错误的nonce值从请求头派生并反射到渲染HTML中，可能导致存储型跨站脚本攻击。
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

Vendor Product Affected Versions CPE Subscribe
vercel next.js >= 13.4.0, < 15.5.16 -

II. Public POCs for CVE-2026-44581

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III. Intelligence Information for CVE-2026-44581

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Vendor Advisories for CVE-2026-44581 (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-2026-44573 7.5 HIGH Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
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-2026-44572 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
Same vendor: vercel
Same weakness: CWE-79

V. Comments for CVE-2026-44581

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