CVE-2026-118247
Highcharts Dashboards / Grid Pro: `DataTable.setCell` and column writers treat `__proto__` as an existing column.
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 and workarounds
Fix
@highcharts/dashboards (npm): OSV reports a fixed version 4.2.2. Check the advisory for supported release branches.
Source: OSV GHSA-c75x-9x9h-28rmFix
@highcharts/grid-pro (npm): OSV reports a fixed version 3.2.0. Check the advisory for supported release branches.
Source: OSV GHSA-c75x-9x9h-28rmAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| highcharts highcharts |
< 13.1.0 (affected) | CNA: GitHub_M |
| dashboards @highcharts |
>= 1.0.0, < 4.2.3 (affected) | CNA: GitHub_M |
| grid-pro @highcharts |
>= 2.0.0, < 3.2.0 (affected) | CNA: GitHub_M |
@highcharts/dashboards@highcharts/dashboards
npm |
≥ 1.0.0; < 4.2.2 (affected, semver); OSV events: introduced 1.0.0; fixed 4.2.2Source events (semver)Other versions: unaffected |
OSV GHSA-c75x-9x9h-28rm |
@highcharts/grid-pro@highcharts/grid-pro
npm |
≥ 2.0.0; < 3.2.0 (affected, semver); OSV events: introduced 2.0.0; fixed 3.2.0Source events (semver)Other versions: unaffected |
OSV GHSA-c75x-9x9h-28rm |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
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 | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/highcharts/highcharts/security/advisories/GHSA-c75x-9x9h-28rmCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/highcharts/highcharts/commit/02dd9349aeb6f4cc9c98806120d917ed316b4c74CNA: GitHub_M · x_refsource_MISC
- https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2CNA: GitHub_M · x_refsource_MISC
- https://github.com/highcharts/highcharts/releases/tag/grid-v3.2.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-c75x-9x9h-28rmOSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-c75x-9x9h-28rmOSV / GitHub Security Advisories · osv
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