# CVE-2026-118246: Highcharts JavaScript event handler injection via breadcrumbs

Source: https://junglewise.ai/threats/cve-2026-118246-highcharts-js-is-a-javascript-charting-library-based-on-svg-from  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-118246 · Severity: high · CVSS 4 · Published 2026-10-28

Highcharts is a widely-used JavaScript charting library for creating interactive SVG-based data visualizations embedded in web applications. An attacker controlling chart configuration can inject event handlers into breadcrumb navigation buttons, causing malicious JavaScript to execute when users interact with the chart after drilling down to nested levels. This could allow account takeover, session hijacking, or data theft within the hosting web page's origin.

Technologies: [highcharts (npm)](https://junglewise.ai/threats/technologies/highcharts). Vendors: [Highcharts](https://junglewise.ai/threats/vendors/highcharts), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-118246 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-118246 being exploited in the wild.

**How severe is CVE-2026-118246?** High severity, with a CVSS score of 4, published 28 October 2026.

**Which products and versions are affected?** Highcharts 10.0.0 to 11.4.8, 12.0.0 to 12.6.0, 13.0.0 to 13.0.x; highcharts (npm) >= 10.0.0, < 11.4.9, SEMVER:introduced=10.0.0,fixed=11.4.9.

**Is there a fix for CVE-2026-118246?** Yes. highcharts (npm): upgrade to 11.4.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-118246 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-118246?** Check whether you run Highcharts or highcharts (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- highcharts (npm): upgrade to 11.4.9 or later

  ```sh
  npm install highcharts@11.4.9
  ```


## Technical details

The vulnerability stems from Highcharts applying breadcrumb.style configuration as SVG attributes without filtering attribute names, allowing injection of event handler attributes (onmouseover, onclick, etc.) through drilldown.breadcrumbs, navigation.breadcrumbs, or hierarchical series breadcrumb options. An attacker who controls chart configuration (e.g., via user-supplied data or XSS) can inject these handlers, which execute in the hosting page origin when the user navigates to a chart level and hovers over or clicks the breadcrumb button. Styled-mode charts are not affected as they apply styles via CSS rather than attributes.

## Affected products

- Highcharts Highcharts 10.0.0 to 11.4.8, 12.0.0 to 12.6.0, 13.0.0 to 13.0.x

## Identifiers

- CVE-2026-118246
- GHSA-35rr-xwfh-x789

## Timeline

- 2026-10-28: disclosed

## References

- [https://github.com/highcharts/highcharts/commit/b0fafdaaee7d0cac2ecfeb0eaf37b11cd40594ef](https://github.com/highcharts/highcharts/commit/b0fafdaaee7d0cac2ecfeb0eaf37b11cd40594ef)
- [https://github.com/highcharts/highcharts/releases/tag/v13.1.0](https://github.com/highcharts/highcharts/releases/tag/v13.1.0)

## Related threats

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- [Highcharts JS prototype pollution in series data](https://junglewise.ai/threats/cve-2026-118249-highcharts-js-is-a-javascript-charting-library-based-on-svg-from)
- [Highcharts JS cross-site scripting via innerHTML fallback on print](https://junglewise.ai/threats/cve-2026-118244-highcharts-js-is-a-javascript-charting-library-based-on-svg-from)
- [Highcharts JS unfiltered xlink:href in exported SVG](https://junglewise.ai/threats/cve-2026-116796-highcharts-js-is-a-javascript-charting-library-based-on-svg-from)