# CVE-2026-56317: Nuxt XSS in NoScript component slot content

Source: https://junglewise.ai/threats/cve-2026-56317-nuxt-xss-in-noscript-component-slot-content  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-20. Updated: 2026-06-21  
License: CC BY 4.0 with a link back

CVE-2026-56317 · Severity: medium · CVSS 4 · Published 2026-06-20

Nuxt is a popular web development framework used to build high-performance websites. A security flaw in its NoScript component allows attackers to inject malicious scripts into a webpage if the site displays untrusted user data (like URL parameters) inside that component. This could lead to unauthorized actions being performed in a user's browser, such as stealing session information or redirecting users to malicious sites.

Technologies: [nuxt (npm)](https://junglewise.ai/threats/technologies/nuxt). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-56317 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56317 being exploited in the wild.

**How severe is CVE-2026-56317?** Medium severity, with a CVSS score of 4, published 20 June 2026.

**Which products and versions are affected?** nuxt (npm) SEMVER:introduced=4.0.0,fixed=4.4.7.

**Is there a fix for CVE-2026-56317?** Yes. nuxt (npm): upgrade to 4.4.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-56317 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-56317?** Check whether you run nuxt (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- nuxt (npm): upgrade to 4.4.7 or later

  ```sh
  npm install nuxt@4.4.7
  ```


## Technical details

A cross-site scripting (XSS) vulnerability exists in the Nuxt <NoScript> component (re-exported from @unhead/vue). The component incorrectly writes its default-slot content to the 'innerHTML' property of the <noscript> head tag instead of using 'textContent', bypassing Vue's standard HTML escaping. When a browser with JavaScript enabled parses the server-rendered HTML, certain tags (like <script>) inside the <noscript> block in the <head> section will implicitly close the <noscript> tag and execute in the document context. Attackers can exploit this by providing malicious payloads through untrusted data sources, such as 'route.query' parameters, if they are interpolated into the <NoScript> slot. The issue is fixed in Nuxt versions 4.4.7 and 3.21.7 by switching to 'textContent' and using 'escapeHtml' from @vue/shared.

## Affected products

- Nuxt Nuxt >= 4.0.0, < 4.4.7; < 3.21.7

## Identifiers

- CVE-2026-56317
- GHSA-m3q2-p4fw-w38m

## Timeline

- 2026-06-02: advisory: GitHub Security Advisory GHSA-m3q2-p4fw-w38m published
- 2026-06-20: disclosed: CVE-2026-56317 published to NVD

## References

- [https://github.com/nuxt/nuxt/commit/4b054e9d95f8daf366cb144b52782047c511a66e](https://github.com/nuxt/nuxt/commit/4b054e9d95f8daf366cb144b52782047c511a66e)
- [https://github.com/nuxt/nuxt/commit/7fea9fd687f1dacbfb63db5fae5839896b017a0e](https://github.com/nuxt/nuxt/commit/7fea9fd687f1dacbfb63db5fae5839896b017a0e)
- [https://github.com/nuxt/nuxt/security/advisories/GHSA-m3q2-p4fw-w38m](https://github.com/nuxt/nuxt/security/advisories/GHSA-m3q2-p4fw-w38m)
- [https://www.vulncheck.com/advisories/nuxt-cross-site-scripting-via-noscript-component-slot-content](https://www.vulncheck.com/advisories/nuxt-cross-site-scripting-via-noscript-component-slot-content)

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