CVE-2026-118243

Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards stores DataCursor listener and state maps in plain objects keyed by DataTable ID. A __proto__ table ID supplied through dataPool connector configuration resolves to Object.prototype, and sync registration creates an enumerable property there whose suffix can be influenced through the sync group option. The property is visible on every object, and lasting sync states can throw and stop features such as extremes synchronization. Exploitation requires untrusted dashboard configuration and an enabled component sync, but no user interaction beyond loading the board. This issue is fixed in 4.2.2.

CVSS

No CVSS.

References

Link	Resource
https://github.com/highcharts/highcharts/commit/ade5a41a700212f09133223ca990a3737d1d9ec6
https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2
https://github.com/highcharts/highcharts/security/advisories/GHSA-jqgh-w3cc-7jqw

Configurations

No configuration.

History

28 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-28 18:17

Updated : 2026-10-29 15:08

NVD link : CVE-2026-118243

Mitre link : CVE-2026-118243

CVE.ORG link : CVE-2026-118243

JSON object : View

Products Affected

No product.

CWE

CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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