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[ CVE-2026-118247 · Published 28 Oct 2026 ]

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

CVSS 6.9 EPSS <1%Fix available

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • @highcharts/dashboards 4.2.2Fixed version · GitHub Advisories · npm package @highcharts/dashboards: upgrade to 4.2.2 or later (affected >= 1.0.0, <= 4.2.1)
  • @highcharts/grid-pro 3.2.0Fixed version · GitHub Advisories · npm package @highcharts/grid-pro: upgrade to 3.2.0 or later (affected >= 2.0.0, <= 3.1.0)

[ Packages ]Affected open-source packages

[ References ]References