{"id":"CVE-2025-29927","aliases":["GHSA-f82v-jwr5-mffw"],"url":"https://o3.security/vulnerability/CVE-2025-29927","summary":"Authorization Bypass in Next.js Middleware","details":"# 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":"2025-03-21T14:34:49.570Z","modified":"2026-10-21T02:30:17.656017728Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":{"score":0.99225,"percentile":0.99935,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":21,"affectedPackages":[{"ecosystem":"npm","name":"next","fixedVersion":"13.5.9"},{"ecosystem":"npm","name":"next","fixedVersion":"14.2.25"},{"ecosystem":"npm","name":"next","fixedVersion":"15.2.3"},{"ecosystem":"npm","name":"next","fixedVersion":"12.3.5"}],"fix":{"url":"https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2","label":"vercel/next.js@52a078d"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/03/23/3"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2025/03/23/4"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v12.3.5"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v13.5.9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/29xxx/CVE-2025-29927.json"},{"type":"ADVISORY","url":"https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-29927"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20250328-0002/"},{"type":"FIX","url":"https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2"},{"type":"FIX","url":"https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48"},{"type":"PACKAGE","url":"https://github.com/vercel/next.js"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20250328-0002"},{"type":"WEB","url":"https://vercel.com/changelog/vercel-firewall-proactively-protects-against-vulnerability-with-middleware"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:30:17.656017728Z"}}