CVE-2026-40181: Shopify React-Router

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs passed to the redirect function can trigger an open redirect to an external domain due to path values starting with // being reinterpreted as protocol-relative URLs. The level of impact depends on the validation done by the application prior to returning the redirect. This does not impact applications using Declarative Mode (<BrowserRouter>). This is patched in versions 7.14.1 and 6.30.4.

Affected products

• Shopify React-Router: from 6.7.0, before 6.30.4 (fixed in 6.30.4); from 7.0.0, before 7.14.1 (fixed in 7.14.1)

Published 2026-06-02. Last modified 2026-08-04.