CVE-2026-53667: React Router: RSCErrorHandler Missing Protocol Validation (XSS)
This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8646-j5j9-6r62. React Router was alerted of a code path in the (unstable) RSC error handling path in which redirects from untrusted sources could still result in an XSS vector via attacker-supplied redirect targets
[!NOTE] This only affects your application if you are using the unstable RSC APIs
References
- github.com/advisories/GHSA-h8fp-f39c-q6mh
- github.com/remix-run/react-router/blob/main/CHANGELOG.md
- github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242
- github.com/remix-run/react-router/pull/15177
- github.com/remix-run/react-router/releases/tag/react-router@7.18.0
- github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh
- nvd.nist.gov/vuln/detail/CVE-2026-53667
Code Behaviors & Features
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