{"id":"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 \u003cScrollRestoration\u003e 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 (\u003cBrowserRouter\u003e) or Data Mode (createBrowserRouter/\u003cRouterProvider\u003e) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.","aliases":["GHSA-8v8x-cx79-35w7"],"modified":"2026-04-29T04:15:03.732603Z","published":"2026-01-10T02:41:44.944Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21884.json","cna_assigner":"GitHub_M","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"last_affected":"@remix-run/react \u003c 2.17.3"},{"last_affected":"react-router  \u003e= 7.0.0, \u003c 7.12.0"}]},{"source":"DESCRIPTION","extracted_events":[{"introduced":"7.0.0"},{"fixed":"7.11.0"}]}],"cwe_ids":["CWE-79"]},"references":[{"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/remix-run/react-router","events":[{"introduced":"e8e3b004d94a949372e77ce97a543bff5bc6fb89"},{"last_affected":"b34a9cd1f74231ded97c1e6ca9dff8f09a1b87ca"}],"database_specific":{"versions":[{"introduced":"7.0.0"},{"last_affected":"7.11.0"}]}}],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"2.17.3"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21884.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"}]}