MEDIUM 6.9 NVD
CVE-2026-118248
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
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.
References
- https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22edaad978b
- https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2
- https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-10-28 via NVD.
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