{"id":"CVE-2026-21884","aliases":["GHSA-8v8x-cx79-35w7"],"url":"https://o3.security/vulnerability/CVE-2026-21884","summary":"React Router SSR XSS in ScrollRestoration","details":"React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, a XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.","published":"2026-01-10T02:41:44.944Z","modified":"2026-08-07T11:30:59.420994879Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"react-router","fixedVersion":"7.12.0"},{"ecosystem":"npm","name":"@remix-run/react","fixedVersion":"2.17.3"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:19712"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3782"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3958"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:3960"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-21884"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21884.json"},{"type":"ADVISORY","url":"https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21884"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2428421"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:30:59.420994879Z"}}