CVE-2026-33245: React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets

June 3, 2026

When using React Router v7’s unstable RSC APIs, there exists a potential client-side XSS issue in the RSC redirect handling if redirects are coming from untrusted sources

[!NOTE] This only impacts your application if you are using the unstable RSC APIs in React Router.

References

github.com/advisories/GHSA-8646-j5j9-6r62
github.com/remix-run/react-router/security/advisories/GHSA-8646-j5j9-6r62
nvd.nist.gov/vuln/detail/CVE-2026-33245

Code Behaviors & Features

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