{
  "canonical_id": "nextjs--CVE-2025-29927",
  "system_id": "nextjs",
  "display_name": "Next.js",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "Authorization Bypass in Next.js Middleware",
  "summary": "# Impact\nIt is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware.\n\n# Patches\n* For Next.js 15.x, this issue is fixed in `15.2.3`\n* For Next.js 14.x, this issue is fixed in `14.2.25`\n* For Next.js 13.x, this issue is fixed in 13.5.9\n* For Next.js 12.x, this issue is fixed in 12.3.5\n* For Next.js 11.x, consult the below workaround.\n\n_Note: Next.js deployments hosted on Vercel are automatically protected against this vulnerability._\n\n# Workaround\nIf patching to a safe version is infeasible, we recommend that you prevent external user requests which contain the `x-middleware-subrequest` header from reaching your Next.js application.\n\n## Credits\n\n- Allam Rachid (zhero;)\n- Allam Yasser (inzo_)",
  "published_at": "2025-03-21T15:20:12Z",
  "updated_at": "2026-03-04T15:06:29.993197Z",
  "severity": "low",
  "cvss_score": 3.1,
  "exploit_status": "unknown",
  "source_confidence": "official",
  "official_source_url": "https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw",
  "secondary_source_urls": [
    "https://nvd.nist.gov/vuln/detail/CVE-2025-29927",
    "https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2",
    "https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48",
    "https://github.com/vercel/next.js",
    "https://github.com/vercel/next.js/releases/tag/v12.3.5",
    "https://github.com/vercel/next.js/releases/tag/v13.5.9",
    "https://security.netapp.com/advisory/ntap-20250328-0002",
    "https://vercel.com/changelog/vercel-firewall-proactively-protects-against-vulnerability-with-middleware",
    "http://www.openwall.com/lists/oss-security/2025/03/23/3",
    "http://www.openwall.com/lists/oss-security/2025/03/23/4"
  ],
  "aliases": [
    "CVE-2025-29927",
    "GHSA-f82v-jwr5-mffw"
  ],
  "cve_ids": [
    "CVE-2025-29927"
  ],
  "ghsa_ids": [
    "GHSA-f82v-jwr5-mffw"
  ],
  "osv_ids": [
    "GHSA-f82v-jwr5-mffw"
  ],
  "affected_versions": [
    "introduced=13.0.0, fixed<13.5.9",
    "introduced=14.0.0, fixed<14.2.25",
    "introduced=15.0.0, fixed<15.2.3",
    "introduced=12.0.0, fixed<12.3.5"
  ],
  "fixed_versions": [
    "13.5.9",
    "14.2.25",
    "15.2.3",
    "12.3.5"
  ],
  "package_name": "next",
  "render_markdown": true,
  "case_path": "07-framework-security/frameworks/nextjs/cases/nextjs-cve-2025-29927.md",
  "secure_code_topics": [
    "authz-server-side-recheck",
    "proxy-trust-boundary",
    "token-cookie-storage"
  ],
  "status": "generated",
  "triage_reasons": [],
  "metadata": {
    "source_names": [
      "OSV Next.js"
    ],
    "source_kinds": [
      "osv-batch"
    ],
    "candidate_count": 1
  }
}