CVE-2026-53667 (GCVE-0-2026-53667)

Vulnerability from cvelistv5 – Published: 2026-07-27 21:21 – Updated: 2026-07-27 21:21
VLAI
Title
React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
Summary
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.
Severity
6.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
remix-run react-router Affected: >= 7.11.0, < 7.18.0
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "react-router",
          "vendor": "remix-run",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 7.11.0, \u003c 7.18.0"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T21:21:16.084Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh"
        },
        {
          "name": "https://github.com/remix-run/react-router/pull/15177",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/remix-run/react-router/pull/15177"
        },
        {
          "name": "https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242"
        },
        {
          "name": "https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180"
        },
        {
          "name": "https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0"
        }
      ],
      "source": {
        "advisory": "GHSA-h8fp-f39c-q6mh",
        "discovery": "UNKNOWN"
      },
      "title": "React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53667",
    "datePublished": "2026-07-27T21:21:16.084Z",
    "dateReserved": "2026-06-09T20:50:36.877Z",
    "dateUpdated": "2026-07-27T21:21:16.084Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53667\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-27T22:17:31.093\",\"lastModified\":\"2026-07-27T22:17:31.093\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"remix-run\",\"product\":\"react-router\",\"versions\":[{\"version\":\"\u003e= 7.11.0, \u003c 7.18.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.6,\"impactScore\":4.7}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"}]}],\"references\":[{\"url\":\"https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/remix-run/react-router/pull/15177\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh\",\"source\":\"security-advisories@github.com\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-28T10:02:51+00:00",
      "cve": "CVE-2026-53667",
      "id": "CVE-2026-53667",
      "initial_release_date": "2026-07-27T21:21:16.084000+00:00",
      "product_status:known_affected": "27",
      "product_status:known_not_affected": "123",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "react-router: React Router: Untrusted redirects due to missing protocol validation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53667.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.