{"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":"Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.","published":"2025-03-21T14:34:49.570Z","modified":"2026-08-12T03:51:45.956852889Z","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":0.99934,"asOf":"2026-09-05"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:45.956852889Z"}}