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CVE-2026-53721— Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher

Quick assessment

Affected
nuxt nuxt
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.

Nuxt是Nuxt团队开源的一个免费的开源框架。 Nuxt 3.11.0至3.21.7之前版本和4.0.0至4.4.7之前版本存在输入验证错误漏洞，该漏洞源于vue-router与routeRules匹配器之间的大小写不匹配，可能导致路由规则中间件绕过。

AI Predicted 7.5 Difficulty: Easy EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
nuxt nuxt >= 3.11.0, < 3.21.7 affected
>= 4.0.0, < 4.4.7 affected
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I. Basic Information for CVE-2026-53721

Vulnerability Information
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Vulnerability Title
Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher
Source: CVE Program / CVE List V5
Vulnerability Description
Nuxt is an open-source web development framework for Vue.js. From versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7, there is a route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher. This issue has been patched in versions 3.21.7 and 4.4.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nuxt 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nuxt是Nuxt团队开源的一个免费的开源框架。 Nuxt 3.11.0至3.21.7之前版本和4.0.0至4.4.7之前版本存在输入验证错误漏洞，该漏洞源于vue-router与routeRules匹配器之间的大小写不匹配，可能导致路由规则中间件绕过。
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
nuxt nuxt >= 3.11.0, < 3.21.7 -

II. Public POCs for CVE-2026-53721

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III. Intelligence Information for CVE-2026-53721

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Patches & Fixes for CVE-2026-53721 (2)

Vendor Advisories for CVE-2026-53721 (1)

Same Patch Batch · nuxt · 2026-06-12 · 7 CVEs total

CVE-2026-53722 Nuxt: Reflected XSS in `<NuxtLink>` via unsanitised `javascript:` or `data:` URL
CVE-2026-45669 Nuxt: Reflected XSS in `navigateTo()` external redirect
CVE-2026-45670 Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA
CVE-2026-47200 Nuxt: Route middleware not enforced when rendering `.server.vue` pages via `/__nuxt_island
CVE-2026-49993 @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when
CVE-2026-46342 Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-c

IV. Related Vulnerabilities

Same product: nuxt
Same vendor: nuxt
Same weakness: CWE-178

V. Comments for CVE-2026-53721

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