CVE-2026-118248 Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118248?
CVE-2026-118248 is a medium-severity vulnerability in @highcharts dashboards, published on 28 Oct 2026.
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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-118248?
How do I fix CVE-2026-118248?
No fix has been published for CVE-2026-118248 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118248 being exploited?
There is no known exploitation of CVE-2026-118248 in the wild and no public exploit code.
Sources
Also known as GHSA-wg5j-9wp8-2ggm.