Vulnerability-Lookup

GHSA-M3Q2-P4FW-W38M

Vulnerability from github – Published: 2026-06-16 23:38 – Updated: 2026-09-09 23:50

Summary

Cross-site scripting via <NoScript> slot content in Nuxt's head components

Details

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 nuxt@4.4.7 (commit 4b054e9d) and backported to nuxt@3.21.7 (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.

Severity

2.3 (Low)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "nuxt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.4.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "nuxt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.21.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-56317"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-16T23:38:47Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Impact\n\nNuxt\u0027s globally registered `\u003cNoScript\u003e` component (from `@unhead/vue` head components, re-exported by Nuxt) wrote its default-slot content to the `innerHTML` of the `\u003cnoscript\u003e` head tag, bypassing the HTML escaping that `{{ }}` interpolation normally applies in Vue templates.\n\nApplications that placed untrusted, attacker-controllable data inside a `\u003cNoScript\u003e` slot, for example:\n\n```vue\n\u003cNoScript\u003e{{ route.query.banner }}\u003c/NoScript\u003e\n```\n\nwould emit that value unescaped inside `\u003cnoscript\u003e` in the server-rendered HTML. With scripting enabled, the HTML parser treats `\u003cnoscript\u003e` content in `\u003chead\u003e` under the \"in head noscript\" insertion mode: any tag other than `link`, `meta`, `noframes`, or `style` implicitly closes `\u003cnoscript\u003e` and is re-processed in the head. A payload such as `\u003cscript\u003e...\u003c/script\u003e` therefore escapes the element and executes in the document context.\n\nSibling head components (`\u003cStyle\u003e`, `\u003cTitle\u003e`) were not affected because they already routed slot text through the safe `textContent` path.\n\n### Affected versions\n\nAll currently supported versions of `nuxt` that ship the `\u003cNoScript\u003e` global component.\n\n### Patches\n\nFixed in `nuxt@4.4.7` (commit [`4b054e9d`](https://github.com/nuxt/nuxt/commit/4b054e9d95f8daf366cb144b52782047c511a66e)) and backported to `nuxt@3.21.7` (commit [`7fea9fd6`](https://github.com/nuxt/nuxt/commit/7fea9fd687f1dacbfb63db5fae5839896b017a0e)). The fix escapes `\u003cNoScript\u003e` 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 `\u003cNoScript\u003e` is no longer parsed as HTML.\n\n### Workarounds\n\nUntil you can upgrade:\n\n- Do not interpolate untrusted input into `\u003cNoScript\u003e` slots. Replace `\u003cNoScript\u003e{{ x }}\u003c/NoScript\u003e` with a static string, or sanitise / HTML-escape `x` at the source.\n- If you must render dynamic noscript content, write the tag yourself via `useHead({ noscript: [{ textContent: escapedValue }] })` after escaping `escapedValue`.\n\n### Credit\n\nReported to Anthropic\u0027s coordinated vulnerability disclosure pipeline by Claude (Anthropic\u0027s AI assistant) and triaged by the Anthropic security team. Reference: ANT-2026-4NJYDFFM.\n\nIndependently reported by [@alcls01111](https://github.com/alcls01111) via GitHub\u0027s coordinated disclosure flow (`GHSA-8grp-wcq9-925q`), closed as a duplicate of this advisory.",
  "id": "GHSA-m3q2-p4fw-w38m",
  "modified": "2026-09-09T23:50:59Z",
  "published": "2026-06-16T23:38:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/security/advisories/GHSA-m3q2-p4fw-w38m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56317"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/commit/4b054e9d95f8daf366cb144b52782047c511a66e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nuxt/nuxt/commit/7fea9fd687f1dacbfb63db5fae5839896b017a0e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nuxt/nuxt"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/nuxt-cross-site-scripting-via-noscript-component-slot-content"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Cross-site scripting via \u003cNoScript\u003e slot content in Nuxt\u0027s head components"
}

CVE-2026-56317 (GCVE-0-2026-56317)

Vulnerability from cvelistv5 – Published: 2026-06-20 15:21 – Updated: 2026-06-24 17:53

Title

Nuxt - Cross-Site Scripting via NoScript Component Slot Content

Summary

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.

Severity

2.3 (Low)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-24 17:52 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/nuxt/nuxt/security/advisories/…	vendor-advisory
https://github.com/nuxt/nuxt/commit/4b054e9d95f8d…	patch
https://github.com/nuxt/nuxt/commit/7fea9fd687f1d…	patch
https://www.vulncheck.com/advisories/nuxt-cross-s…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
Nuxt	Nuxt	Affected: 4.0.0 , < 4.4.7 (semver) Unaffected: 4.4.7 (semver)
Nuxt	Nuxt	Affected: 0 , < 3.21.7 (semver) Unaffected: 3.21.7 (semver)

Date Public

2026-06-02 00:00

Credits

alcls01111

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.