Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118247Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.
Medium 6.9
In plain English
A medium-severity prototype pollution in dashboards from @highcharts. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @highcharts/dashboards | 4.2.2 | GHSA-c75x-9x9h-28rm |
| npm | @highcharts/grid-pro | 3.2.0 | GHSA-c75x-9x9h-28rm |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| highcharts | highcharts | < 13.1.0 |
| @highcharts | dashboards | >= 1.0.0, < 4.2.3 |
| @highcharts | grid-pro | >= 2.0.0, < 3.2.0 |
Weakness: CWE-1321 · Vector: 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
References
- https://github.com/highcharts/highcharts/security/advisories/GHSA-c75x-9x9h-28rm x_refsource_CONFIRM
- https://github.com/highcharts/highcharts/commit/02dd9349aeb6f4cc9c98806120d917ed316b4c74 x_refsource_MISC
- https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2 x_refsource_MISC
- https://github.com/highcharts/highcharts/releases/tag/grid-v3.2.0 x_refsource_MISC