{"cve":"CVE-2026-44574","nvd":{"published":"2026-05-13T17:16:22.767","modified":"2026-10-26T17:10:03.270","status":"Modified","description":"Next.js is a React framework for building full-stack web applications. From 15.4.0 to before 15.5.16 and 16.2.5, applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially crafted query parameters can alter the dynamic route value seen by the page while leaving the visible path unchanged, which can allow protected content to be rendered without passing the expected middleware check. This vulnerability is fixed in 15.5.16 and 16.2.5.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-288","CWE-551"],"references":["https://github.com/vercel/next.js/security/advisories/GHSA-492v-c6pp-mqqv","https://access.redhat.com/errata/RHSA-2026:34608","https://access.redhat.com/errata/RHSA-2026:37272","https://access.redhat.com/errata/RHSA-2026:40974","https://access.redhat.com/errata/RHSA-2026:54435"],"products":["vercel:next.js"],"source":"nvd","synced_at":"2026-10-26T17:39:09.812804557+00:00"},"epss":{"cve":"CVE-2026-44574","score":0.00636,"percentile":0.50216,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-492v-c6pp-mqqv","url":"https://osv.dev/vulnerability/GHSA-492v-c6pp-mqqv","summary":"Next.js has a Middleware / Proxy bypass through dynamic route parameter injection","modified":"2026-09-10T03:51:04.588942784Z","packages":[{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=15.4.0 <15.5.16"],"fixed":["15.5.16"]},{"ecosystem":"npm","name":"next","purl":"pkg:npm/next","ranges":[">=16.0.0 <16.2.5"],"fixed":["16.2.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}