{"schema_version":"1.9.0","id":"CVE-2026-21884","published":"2026-01-10T02:41:44.944Z","modified":"2026-08-12T03:51:38.027247828Z","aliases":["GHSA-8v8x-cx79-35w7"],"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/remix-run/react-router","events":[{"introduced":"e8e3b004d94a949372e77ce97a543bff5bc6fb89"},{"fixed":"b34a9cd1f74231ded97c1e6ca9dff8f09a1b87ca"}],"database_specific":{"cpe":"cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"7.0.0"},{"fixed":"7.11.0"},{"last_affected":"7.11.0"}],"source":["DESCRIPTION","CPE_RANGE"]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-21884.json"}}],"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"}],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21884.json","unresolved_ranges":[{"extracted_events":[{"introduced":"@remix-run/react < 2.17.3"},{"last_affected":"@remix-run/react < 2.17.3"},{"introduced":"react-router  >= 7.0.0, < 7.12.0"},{"last_affected":"react-router  >= 7.0.0, < 7.12.0"}],"source":"AFFECTED_FIELD"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"}]}