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CVE-2026-118247— Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.

Quick assessment

Affected
highcharts highcharts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Highcharts JS 是一款基于 SVG 的 JavaScript 图表库。在 Dashboards 1.0.0 至 4.2.2 版本，以及 Grid Pro 2.0.0 至 3.2.0 版本中，Highcharts DataTable 的单单元格写入器会将不受信任的列 ID 直接用作键，且未对 或 进行拒绝处理。因此， （包括 Dashboards 连接器回写功能和 Grid Pro 编辑路径）能够向 或 构造函数写入以整数为索引的值。在支持列别名的 Dashboards 版本中，字面量 ID 会被别名映射

CVSS 6.9 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
@highcharts dashboards >= 1.0.0, < 4.2.3 affected
@highcharts grid-pro >= 2.0.0, < 3.2.0 affected
highcharts highcharts < 13.1.0 affected
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I. Basic Information for CVE-2026-118247

Vulnerability Information
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Vulnerability Title
Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
highcharts highcharts < 13.1.0 -
@highcharts dashboards >= 1.0.0, < 4.2.3 -
@highcharts grid-pro >= 2.0.0, < 3.2.0 -

II. Public POCs for CVE-2026-118247

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III. Intelligence Information for CVE-2026-118247

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Patches & Fixes for CVE-2026-118247 (1)

Vendor Advisories for CVE-2026-118247 (1)

Vendor Pages for CVE-2026-118247 (2)

Same Patch Batch · highcharts · 2026-10-28 · 16 CVEs total

CVE-2026-118245 8.6 HIGH Highcharts Dashboards: `chartConstructor` is an unchecked lookup into the Highcharts names
CVE-2026-118254 8.6 HIGH Highcharts Grid: pagination language options are parsed as HTML
CVE-2026-116797 8.5 HIGH Highcharts Grid Pro: cell-renderer `attributes` map written with raw `setAttribute`
CVE-2026-118242 8.5 HIGH Highcharts Grid: custom icon definition objects written with raw `setAttribute` on `<path>
CVE-2026-118246 8.4 HIGH Highcharts Core: `breadcrumbs.style` keys become SVG event-handler attributes
CVE-2026-118253 8.4 HIGH Highcharts Dashboards: fullscreen labels are parsed as HTML
CVE-2026-118251 8.4 HIGH Highcharts: javascript: URL in credits.href runs script on click
CVE-2026-118252 8.4 HIGH Highcharts Dashboards: sidebar component labels are parsed as HTML
CVE-2026-118255 8.4 HIGH Highcharts Grid: javascript: URL in credits.href runs script on click
CVE-2026-116796 7.2 HIGH Highcharts Core: `javascript:` URL in an `xlink:href` attribute survives text filtering an
CVE-2026-118244 7.2 HIGH Highcharts Core: AST `DOMParser` fallback assigns unsanitized markup to `innerHTML` during
CVE-2026-118250 7.2 HIGH Highcharts: dotted series.keys paths write to Object.prototype
CVE-2026-118249 7.2 HIGH Highcharts: series column construction writes to Object.prototype
CVE-2026-118248 6.9 MEDIUM Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype
CVE-2026-118243 5.3 MEDIUM Highcharts Dashboards: `__proto__` data table id writes sync listeners to `Object.prototyp

IV. Related Vulnerabilities

Same product: highcharts
Same vendor: highcharts
Same weakness: CWE-1321