React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)

{
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  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-53667",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-07-28T13:51:15.333Z",
    "dateReserved": "2026-06-09T20:50:36.877Z",
    "datePublished": "2026-07-27T21:21:16.084Z",
    "state": "PUBLISHED"
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      },
      "title": "React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)",
      "descriptions": [
        {
          "lang": "en",
          "value": "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": [
        {
          "vendor": "remix-run",
          "product": "react-router",
          "versions": [
            {
              "version": ">= 7.11.0, < 7.18.0",
              "status": "affected"
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          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
              "cweId": "CWE-79",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh",
          "name": "https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh",
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        {
          "url": "https://github.com/remix-run/react-router/pull/15177",
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        {
          "url": "https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180",
          "name": "https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180",
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          "url": "https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0",
          "name": "https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0",
          "tags": [
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      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "availabilityImpact": "NONE",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM"
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    "adp": [
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          "dateUpdated": "2026-07-28T13:51:15.333Z"
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        "title": "CISA ADP Vulnrichment",
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