Highcharts Dashboards/Grid Pro DataTable DataTable.setCell column ID prototype pollution

Summaryinfo

A vulnerability labeled as critical has been found in Highcharts Dashboards and Grid Pro. This affects the function DataTable.setCell of the component DataTable. Such manipulation of the argument column ID leads to prototype pollution. This vulnerability is traded as CVE-2026-118247. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Highcharts Dashboards and Grid Pro (the affected version unknown) and classified as critical. Affected by this issue is the function DataTable.setCell of the component DataTable. The manipulation of the argument column ID with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-118247 since 10/27/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/28/2026). The MITRE ATT&CK project declares the attack technique as T1059.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Forum Software

Vendor

• Highcharts

Name

• Dashboards
• Grid Pro

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