{"id":"CVE-2026-53667","aliases":["GHSA-h8fp-f39c-q6mh"],"title":"React Router: RSCErrorHandler Missing Protocol Validation (XSS)","summary":"React Router: RSCErrorHandler Missing Protocol Validation (XSS)","severity":"medium","cvss":6.9,"cwe":["CWE-79"],"vendor":"react-router","product":"react-router","ecosystem":"npm","affected":["react-router >= 7.11.0, < 7.18.0"],"patched":["react-router 7.18.0"],"published":"2026-07-23","updated":"2026-07-23","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-h8fp-f39c-q6mh","references":[{"url":"https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh"},{"url":"https://github.com/remix-run/react-router/pull/15177"},{"url":"https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242"},{"url":"https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180"},{"url":"https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0"},{"url":"https://github.com/advisories/GHSA-h8fp-f39c-q6mh"}],"tags":["ghsa","npm"],"ingestedAt":"2026-07-23T20:19:19.548Z","epss":0.00355,"epssPercentile":0.26479,"slug":"CVE-2026-53667","body":"## Overview\n\nThis 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\n\n> [!NOTE]\n> This only affects your application if you are using the unstable RSC APIs\n\n## Affected packages\n\n- `react-router >= 7.11.0, < 7.18.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `react-router 7.18.0`","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}