Highcharts up to 11.4.8/12.6.0/3.0.x Series Keys Path series.keys prototype pollution

Summaryinfo

A vulnerability described as critical has been identified in Highcharts up to 11.4.8/12.6.0/3.0.x. This issue affects some unknown processing of the component Series Keys Path Handler. Executing a manipulation of the argument series.keys can lead to prototype pollution. This vulnerability is handled as CVE-2026-118250. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Highcharts up to 11.4.8/12.6.0/3.0.x. It has been declared as critical. This vulnerability affects an unknown code block of the component Series Keys Path Handler. The manipulation of the argument series.keys with an unknown input leads to a prototype pollution vulnerability. The CWE definition for the vulnerability is CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Highcharts JS is a JavaScript charting library based on SVG. From 6.1.0 until 11.4.9, 12.6.1, and 3.1.0, Highcharts follows dot-separated series.keys paths without filtering each segment. An attacker who controls series.keys and matching point data can use a path through __proto__ to assign arbitrary named properties to Object.prototype. Those properties are visible to all JavaScript in the page, and no user interaction is required beyond rendering the chart. This issue is fixed in 11.4.9, 12.6.1, and 3.1.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-118250 since 10/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 3.1.0, 11.4.9 or 12.6.1 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Highcharts

Version

• 3.0
• 11.4.0
• 11.4.1
• 11.4.2
• 11.4.3
• 11.4.4
• 11.4.5
• 11.4.6
• 11.4.7
• 11.4.8
• 12.0
• 12.1
• 12.2
• 12.3
• 12.4
• 12.5
• 12.6.0

Website

• Product: https://github.com/highcharts/highcharts/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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