React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets

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...

CVE-2026-34077

React Router upstream vulnerability CVE-2026-34077 affects versions 7.7.0–7.13.1 where, when using unstable React Server Components APIs, the RSC redirect handling can lead to a client-side XSS if redirects come from untrusted sources. The issue does not impact non-RSC applications. A fix is avai...

PT-2026-45826

Name of the Vulnerable Software and Affected Versions React Router versions 7.7.0 through 7.13.1 Description A client-side Cross-Site Scripting XSS issue exists in the redirect handling of the unstable React Server Components RSC APIs. This occurs when redirects originate from untrusted sources...