Highcharts up to 4.2.2 Edit-Mode Sidebar cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Highcharts up to 4.2.2. The impacted element is an unknown function of the component Edit-Mode Sidebar. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2026-118252. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Highcharts up to 4.2.2. Affected by this vulnerability is an unknown functionality of the component Edit-Mode Sidebar. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.3, Highcharts Dashboards edit-mode sidebar parses component language strings as HTML rather than inserting them as text. An attacker who controls the Dashboards language configuration can provide markup containing event handlers, which execute in the hosting page origin when a user opens the edit-mode sidebar and the affected labels render. This issue is fixed in 4.2.3.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-118252 since 10/27/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 4.2.3 eliminates this vulnerability.

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Productinfo

Name

• Highcharts

Version

• 4.2.0
• 4.2.1
• 4.2.2

Website

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

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