CVE-2026-53667: Shopify React-Router

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.

Affected products

• Shopify React-Router: from 7.11.0, before 7.18.0 (fixed in 7.18.0)

Published 2026-07-27. Last modified 2026-08-03.