Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118248Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype
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 0.3% (higher than 21% of all known vulnerabilities).
Official description
Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards edit mode walks editableOptions propertyPath segments without rejecting prototype-related keys. An attacker who controls editableOptions can provide a path through __proto__ or constructor, and a user's edit writes the configured value onto Object.prototype. The property then becomes visible to JavaScript throughout the page, with consequences determined by the consuming application. This issue is fixed in 4.2.2.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| highcharts | highcharts | < 13.1.0 |
| @highcharts | dashboards | >= 1.0.0, < 4.2.2 |
Weakness: CWE-1321 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:H/SC:L/SI:L/SA:L