medium6.9
CVE-2026-53667
React Router: RSCErrorHandler Missing Protocol Validation (XSS)
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | react-router | >= 7.11.0, < 7.18.0 | 7.18.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Shopify | React-Router | from 7.11.0 before 7.18.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h8fp-f39c-q6mh
- https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh
- https://github.com/remix-run/react-router/pull/15177
- https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242
- https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
- https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0