CVE-2026-118247 Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-118247?
CVE-2026-118247 is a medium-severity vulnerability in @highcharts dashboards, published on 28 Oct 2026.
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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-118247?
4 open source packages ship an affected version, including @highcharts/dashboards and @highcharts/grid-pro.
| Package | Affected | Fixed in |
|---|---|---|
@highcharts/dashboards npm | From 1.0.0 | 4.2.2 |
@highcharts/dashboards npm | From 1.0.0 | 4.2.2 |
@highcharts/grid-pro npm | From 2.0.0 | 3.2.0 |
@highcharts/grid-pro npm | From 2.0.0 | 3.2.0 |
How do I fix CVE-2026-118247?
Upgrade @highcharts/dashboards to 4.2.2 or later.
Is CVE-2026-118247 being exploited?
There is no known exploitation of CVE-2026-118247 in the wild and no public exploit code.
Sources
Also known as GHSA-c75x-9x9h-28rm.