{"id":"CVE-2026-21884","title":"React Router is a router for React","summary":"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/stora…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N","cwe":["CWE-79"],"vendor":"shopify","product":"react-router","affected":["react-router >= 7.0.0, <= 7.11.0","remix-run/react < 2.17.3"],"patched":["remix-run/react 2.17.3"],"published":"2026-01-10","updated":"2026-06-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-21884","references":[{"url":"https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19712","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:3782","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:3958","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:3960","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-21884","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2428421","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-21884"},{"url":"https://github.com/remix-run/react-router/pull/14705"},{"url":"https://github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608d"},{"url":"https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120"},{"url":"https://github.com/advisories/GHSA-8v8x-cx79-35w7"}],"tags":["nvd","ghsa","npm"],"epss":0.00539,"epssPercentile":0.44273,"ingestedAt":"2026-06-30T13:26:50.278Z","aliases":["GHSA-8v8x-cx79-35w7"],"ecosystem":"npm","slug":"CVE-2026-21884","body":"## Overview\n\nReact 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.\n\n## Affected\n\n- `react-router >= 7.0.0, <= 7.11.0`\n- `remix-run/react < 2.17.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `remix-run/react 2.17.3`\n\n## Package advisory (CVE-2026-21884)\n\nAffected packages:\n\n- `react-router >= 7.0.0, < 7.12.0`\n- `@remix-run/react < 2.17.3`\n\nPatched in:\n\n- `react-router 7.12.0`\n- `@remix-run/react 2.17.3`\n\nSource: https://github.com/advisories/GHSA-8v8x-cx79-35w7","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}