CVE-2026-33245 React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets
Attackers can execute arbitrary scripts via malicious redirects in React Router's unstable RSC APIs, requiring an upgrade to the latest version.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-33245?
CVE-2026-33245 is a high-severity cross-site scripting vulnerability in remix-run react-router, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
Weakness: CWE-79
Which versions are affected by CVE-2026-33245?
2 open source packages ship an affected version, including react-router. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
react-router npm | From 7.7.0 | 7.13.2 |
react-router npm | From 7.7.0 | 7.13.2 |
Products include Shopify React-Router.
How do I fix CVE-2026-33245?
Upgrade react-router to 7.13.2 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-33245 being exploited?
There is no known exploitation of CVE-2026-33245 in the wild and no public exploit code.
Other vulnerabilities in remix-run react-router
- CVE-2026-55685 React Router: Unauthenticated Denial of Service via Inefficient Route Matching
- CVE-2026-21884 React Router SSR XSS in ScrollRestoration
- CVE-2026-42211 React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE
- CVE-2026-22029 React Router vulnerable to XSS via Open Redirects
- CVE-2025-59057 React Router has XSS Vulnerability
Sources
Also known as GHSA-8646-j5j9-6r62, ROOT-APP-NPM-CVE-2026-33245.