{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "13.1.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "1.0.0"
                  },
                  {
                    "fixed": "4.2.3"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "2.0.0"
                  },
                  {
                    "fixed": "3.2.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "02dd9349aeb6f4cc9c98806120d917ed316b4c74"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "dashboards-v4.2.2",
                "range": [
                  {
                    "fixed": "a6d047d719460b0de3aa79adb032115dcdc79054"
                  }
                ],
                "source": "REFERENCES_TAG"
              },
              {
                "original_tag": "grid-v3.2.0",
                "range": [
                  {
                    "fixed": "a7cf00c9b884aa7ebaad57d6dca4032bbc0409f3"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5d3e905ce2e2c75c174c06cf8dee0f00a5e02841"
            },
            {
              "introduced": "ccdecb8282b7c857f6277b885c2657e4fb401f51"
            },
            {
              "fixed": "1aacf2433fb94b1658300616fd442f82b774f9c5"
            },
            {
              "introduced": "1aaa4368e36f90a6909ed1adb6e3675c800f9374"
            },
            {
              "fixed": "a7cf00c9b884aa7ebaad57d6dca4032bbc0409f3"
            },
            {
              "fixed": "02dd9349aeb6f4cc9c98806120d917ed316b4c74"
            },
            {
              "fixed": "a6d047d719460b0de3aa79adb032115dcdc79054"
            }
          ],
          "repo": "https://github.com/highcharts/highcharts",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c75x-9x9h-28rm"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118247.json"
  },
  "details": "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.",
  "id": "CVE-2026-118247",
  "modified": "2026-10-29T02:30:53.940553077Z",
  "published": "2026-10-28T17:50:59.526Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118247.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/highcharts/highcharts/commit/02dd9349aeb6f4cc9c98806120d917ed316b4c74"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/highcharts/highcharts/releases/tag/grid-v3.2.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/highcharts/highcharts/security/advisories/GHSA-c75x-9x9h-28rm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118247"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column."
}