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CVE-2026-46342— Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-cache poisoning

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 3.1.0版本至3.21.6之前版本、4.0.0-alpha.1版本至4.4.6之前版本存在安全漏洞，该漏洞源于/__nuxt_island/*端点接受攻击者控制的props查询/主体参数并渲染任何island组件，未验证URL哈希是否由<NuxtIsland>针对这些输入颁发，且哈希未在服务端验证。

AI Predicted 9.1 Difficulty: Easy EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
nuxt nuxt >= 3.1.0, < 3.21.6 affected
>= 4.0.0-alpha.1, < 4.4.6 affected
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I. Basic Information for CVE-2026-46342

Vulnerability Information
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Vulnerability Title
Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-cache poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
Nuxt is an open-source web development framework for Vue.js. In Nuxt versions 3.1.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6 and @nuxt/nitro-server versions 3.20.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6, the /__nuxt_island/* endpoint accepts attacker-controlled props query/body parameters and renders any island component without verifying that the URL-resident hash (<Name>_<hashId>.json) was actually issued for those inputs by <NuxtIsland>. The hash is computed and embedded client-side but never validated server-side, so the same path can return materially different responses depending on the query. This issue has been patched in versions 3.21.6 and 4.4.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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
Nuxt 信任管理问题漏洞
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 3.1.0版本至3.21.6之前版本、4.0.0-alpha.1版本至4.4.6之前版本存在安全漏洞，该漏洞源于/__nuxt_island/*端点接受攻击者控制的props查询/主体参数并渲染任何island组件，未验证URL哈希是否由<NuxtIsland>针对这些输入颁发，且哈希未在服务端验证。
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 >= 3.1.0, < 3.21.6 -

II. Public POCs for CVE-2026-46342

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III. Intelligence Information for CVE-2026-46342

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Patches & Fixes for CVE-2026-46342 (1)

Vendor Advisories for CVE-2026-46342 (1)

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

CVE-2026-53721 Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and th
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

IV. Related Vulnerabilities

Same product: nuxt
Same vendor: nuxt
Same weakness: CWE-79

V. Comments for CVE-2026-46342

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