CVE-2026-33244: Shopify React-Router

Medium severity, CVSS 5.4. EPSS: 0.1% chance of exploitation in the next 30 days.

React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically generated HTML files if the redirect location comes from an untrusted source. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.13.2.

Affected products

• Shopify React-Router: from 7.5.1, before 7.13.2 (fixed in 7.13.2)

Published 2026-06-02. Last modified 2026-07-21.