Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.

{
  "id": "fcc6748ec7afdb6c4b01187069d8428604d78f9fcf5b2219194f6108d68d5c5a",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-118247",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.",
    "summary": "Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until Dashboards 4.2.2, and from 2.0.0 until Grid Pro 3.2.0, Highcharts DataTable single-cell writers use an untrusted column ID as a key without rejecting __proto__ or constructor. DataTable.setCell, including Dashboards connector write-back and Grid Pro editing paths, can therefore write integer-indexed values onto Object.prototype or the Object constructor. In Dashboards releases with column aliases, a literal __proto__ ID is redirected by the alias map, while an alias targeting __proto__ reaches the unsafe write; later releases without aliases accept the unsafe ID directly. Those inherited values affect array and object reads and for-in enumeration throughout the page, which can alter application control flow or disrupt rendering. Exploitation requires control of the table or component column ID and a cell, point, or API write. This issue is fixed in Dashboards 4.2.2 and Grid Pro 3.2.0.",
    "evidence": "cve:CVE-2026-118247",
    "products": [
      {
        "name": {
          "value": "highcharts",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "dashboards",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "grid-pro",
          "evidence": "/containers/cna/affected/2/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-118247",
      "aliases": [
        "CVE-2026-118247"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.9,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:H/SC:L/SI:L/SA:L",
            "userInteraction": "ACTIVE",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "privilegesRequired": "LOW",
            "subIntegrityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "subAvailabilityImpact": "LOW",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE"
          }
        }
      ],
      "affected": [
        {
          "vendor": "highcharts",
          "product": "highcharts",
          "versions": [
            {
              "status": "affected",
              "version": "< 13.1.0"
            }
          ]
        },
        {
          "vendor": "@highcharts",
          "product": "dashboards",
          "versions": [
            {
              "status": "affected",
              "version": ">= 1.0.0, < 4.2.3"
            }
          ]
        },
        {
          "vendor": "@highcharts",
          "product": "grid-pro",
          "versions": [
            {
              "status": "affected",
              "version": ">= 2.0.0, < 3.2.0"
            }
          ]
        }
      ],
      "modified": "2026-10-28T17:50:59.526Z",
      "provider": "cve",
      "references": [
        "https://github.com/highcharts/highcharts/security/advisories/GHSA-c75x-9x9h-28rm",
        "https://github.com/highcharts/highcharts/commit/02dd9349aeb6f4cc9c98806120d917ed316b4c74",
        "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2",
        "https://github.com/highcharts/highcharts/releases/tag/grid-v3.2.0"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-28T17:50:59.526Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-118247",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 468483,
  "published_at": "2026-10-28T17:50:59.526+00:00"
}