{"id":"CVE-2026-118247","summary":"Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.","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.","aliases":["GHSA-c75x-9x9h-28rm"],"modified":"2026-10-29T02:47:51.987681753Z","published":"2026-10-28T17:50:59.526Z","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"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/highcharts/highcharts","events":[{"introduced":"0"},{"fixed":"5d3e905ce2e2c75c174c06cf8dee0f00a5e02841"},{"introduced":"ccdecb8282b7c857f6277b885c2657e4fb401f51"},{"fixed":"1aacf2433fb94b1658300616fd442f82b774f9c5"},{"introduced":"1aaa4368e36f90a6909ed1adb6e3675c800f9374"},{"fixed":"a7cf00c9b884aa7ebaad57d6dca4032bbc0409f3"},{"fixed":"02dd9349aeb6f4cc9c98806120d917ed316b4c74"},{"fixed":"a6d047d719460b0de3aa79adb032115dcdc79054"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"fixed":"13.1.0"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"source":"AFFECTED_FIELD","strategy":"StringRangeExpression","range":[{"introduced":"1.0.0"},{"fixed":"4.2.3"}]},{"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"}]}}],"versions":["v13.0.0","v13.0.2","v13.0.1","dashboards-v4.2.1","grid-v3.1.0","dashboards-v4.2.0","grid-v3.0.0","v12.6.0","grid-v2.3.1","grid-v2.3.0","dashboards-v4.1.0","grid-v2.2.0","v12.5.0","grid-v2.1.0","grid-v2.0.1","dashboards-v4.0.0","grid-v2.0.0","dashboards-v3.6.0","grid-v1.4.0","v12.4.0","grid-v1.3.0","dashboards-v3.5.0","grid-v1.2.0","dashboards-v3.4.0","v12.3.0","grid-v1.1.0","dashboards-v3.3.0","v12.2.0","grid-v1.0.1","dashboards-v3.2.0","grid-v1.0.0","v4.2.1","v4.2.0","v4.1.10","highstock-v2.1.10","highmaps-v1.1.10","v4.1.9","highstock-v2.1.9","highmaps-v1.1.9","v4.1.8","highstock-v2.1.8","highmaps-v1.1.8","v4.1.6","highstock-v2.1.6","highmaps-v1.1.6","v4.1.5","highstock-v2.1.5","highmaps-v1.1.5","v4.1.3","highstock-v2.1.3","highmaps-v2.1.3","v4.1.0","highstock-v2.1.0","highmaps-v1.1.0","highmaps-v1.0.2","v4.0.1","highstock-v2.0.1","v3.0.8","highstock-v1.3.8","v3.0.5","highstock-v1.3.5","v3.0.4","highstock-v1.3.4","v3.0.3","highstock-v1.3.3","v3.0.2","highstock-v1.3.2","v3.0.1","highstock-v1.3.1","v3.0.0","highstock-v1.3.0","v2.3.5","highstock-v1.2.5","highstock-v1.2.4","v2.3.3","highstock-v1.2.3","v2.3.2","highstock-v1.2.2","v2.3.0","highstock-v1.2.0","highstock-v1.1.6","v2.2.5","v2.2.4","v2.2.2","highstock-v1.1.5","v2.2.1","highstock-v1.1.4","highstock-v1.1.3","highstock-v1.1.2","highstock-v1.1.1","highstock-v1.1.0","highstock-v1.0.1","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.5","v2.0.4","v2.0.3","v2.0.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118247.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","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"}]}