React Router SSR XSS in ScrollRestoration

Description

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.

Recommendation

Update the @remix-run/react package to the latest compatible version. Followings are version details:

• Affected version(s): < 2.17.3
• Patched version(s): 2.17.3

References

• GHSA-8v8x-cx79-35w7
• CVE-2026-21884
• CWE-79
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• React Router has XSS Vulnerability - CVE-2025-59057
• Svelte affected by XSS in SSR `<option>` element - CVE-2026-27119
• Svelte: XSS via HTML Comment Injection in SSR Error Boundary Hydration Markers - CVE-2026-27902
• Svelte vulnerable to XSS during SSR with contenteditable `bind:innerText` and `bind:textContent` - CVE-2026-27901

Tags:

npm

@remix-run/react