Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22e
- https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2
- https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm
FAQ
What is CVE-2026-118248?
CVE-2026-118248 is a documented vulnerability. 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 key...
How severe is CVE-2026-118248?
CVSS scoring is not yet available for CVE-2026-118248. Check NVD for updates.
Is there a patch for CVE-2026-118248?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.