CVE-2026-56317

Impact

Nuxt's globally registered <NoScript> component (from @unhead/vue head components, re-exported by Nuxt) wrote its default-slot content to the innerHTML of the <noscript> head tag, bypassing the HTML escaping that {{ }} interpolation normally applies in Vue templates.

Applications that placed untrusted, attacker-controllable data inside a <NoScript> slot, for example:

<NoScript>{{ route.query.banner }}</NoScript>

would emit that value unescaped inside <noscript> in the server-rendered HTML. With scripting enabled, the HTML parser treats <noscript> content in <head> under the "in head noscript" insertion mode: any tag other than link, meta, noframes, or style implicitly closes <noscript> and is re-processed in the head. A payload such as <script>...</script> therefore escapes the element and executes in the document context.

Sibling head components (<Style>, <Title>) were not affected because they already routed slot text through the safe textContent path.

Affected versions

All currently supported versions of nuxt that ship the <NoScript> global component.

Patches

Fixed in [email protected] (commit 4b054e9d) and backported to [email protected] (commit 7fea9fd6). The fix escapes <NoScript> slot content with escapeHtml from @vue/shared and writes it to textContent rather than innerHTML. Slot content is now rendered as text; intentional markup inside <NoScript> is no longer parsed as HTML.

Workarounds

Until you can upgrade:

• Do not interpolate untrusted input into <NoScript> slots. Replace <NoScript>{{ x }}</NoScript> with a static string, or sanitise / HTML-escape x at the source.
• If you must render dynamic noscript content, write the tag yourself via useHead({ noscript: [{ textContent: escapedValue }] }) after escaping escapedValue.

Credit

Reported to Anthropic's coordinated vulnerability disclosure pipeline by Claude (Anthropic's AI assistant) and triaged by the Anthropic security team. Reference: ANT-2026-4NJYDFFM.

Independently reported by @alcls01111 via GitHub's coordinated disclosure flow (GHSA-8grp-wcq9-925q), closed as a duplicate of this advisory.

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-m3q2-p4fw-w38m. This link is maintained to preserve external references.

Original Description

Nuxt before 4.4.7 (and the 3.x branch before 3.21.7) contains a cross-site scripting vulnerability in the NoScript component that writes slot content to innerHTML without escaping. Attackers can inject malicious scripts through untrusted data in NoScript slots, such as route.query parameters, which execute in the document context when the noscript tag is implicitly closed by script tags.

TuxCare rebuilt nuxt to address 2 CVEs. Fixed in 0.10.7-tuxcare.4.

TuxCare rebuilt nuxt to address 1 CVE. Fixed in 1.4.5-tuxcare.5.

TuxCare rebuilt nuxt to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt nuxt to address 11 CVEs. Fixed in 3.12.4-tuxcare.12.

TuxCare rebuilt nuxt to address 1 CVE. Fixed in 3.12.3-tuxcare.8.

TuxCare rebuilt nuxt to address 1 CVE. Fixed in 2.18.1-tuxcare.5.

TuxCare rebuilt nuxt to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/kit to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt @nuxt/kit to address 11 CVEs. Fixed in 3.12.4-tuxcare.12.

TuxCare rebuilt @nuxt/kit to address 1 CVE. Fixed in 3.12.3-tuxcare.8.

TuxCare rebuilt @nuxt/kit to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/rspack-builder to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/schema to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt @nuxt/schema to address 11 CVEs. Fixed in 3.12.4-tuxcare.12.

TuxCare rebuilt @nuxt/schema to address 1 CVE. Fixed in 3.12.3-tuxcare.8.

TuxCare rebuilt @nuxt/schema to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/vite-builder to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt @nuxt/vite-builder to address 11 CVEs. Fixed in 3.12.4-tuxcare.12.

TuxCare rebuilt @nuxt/vite-builder to address 1 CVE. Fixed in 3.12.3-tuxcare.8.

TuxCare rebuilt @nuxt/vite-builder to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/webpack-builder to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt @nuxt/webpack-builder to address 11 CVEs. Fixed in 3.12.4-tuxcare.12.

TuxCare rebuilt @nuxt/webpack-builder to address 1 CVE. Fixed in 3.12.3-tuxcare.8.

TuxCare rebuilt @nuxt/webpack-builder to address 7 CVEs. Fixed in 4.0.3-tuxcare.7.

TuxCare rebuilt @nuxt/test-utils to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.

TuxCare rebuilt nuxi to address 3 CVEs. Fixed in 3.2.0-tuxcare.5.