{"id":"CVE-2026-118247","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-118247","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…","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.","published":"2026-10-28T18:17:15.690","modified":"2026-10-28T18:17:15.690","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/highcharts/highcharts/commit/02dd9349aeb6f4cc9c98806120d917ed316b4c74","label":"highcharts/highcharts@02dd934"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/highcharts/highcharts/security/advisories/GHSA-c75x-9x9h-28rm"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T18:17:15.690"}}