Highcharts Core: `javascript:` URL in an `xlink:href` attribute survives text filtering and reaches exported charts

影響: npm:highcharts >= 10.3.2, < 11.4.9 → 11.4.9, npm:highcharts >= 12.0.0, < 12.6.2 → 12.6.2, npm:highcharts >= 13.0.0, <= 13.1.0 → 13.1.1

The filter applied to markup in text options checks href, src and a few similar attributes against an allowed-scheme list, but accepts xlink:href without that check, so an SVG anchor whose xlink:href is a javascript: URL passes the filter, whether or not the option is rendered with useHTML. In the live page the attribute is written without the XLink namespace, so browsers do not treat the anchor as a link there. The attribute is preserved verbatim in the chart's serialised output: the SVG produ…

Read on GitHub Advisory Database

On 10/29/2026, 04:55 AM, GitHub Advisory Database published "Highcharts Core: `javascript:` URL in an `xlink:href` attribute survives text filtering and reaches exported charts" (type: Advisory). Severity is "High" (high). Related technologies: JavaScript / Node.js. CVE: CVE-2026-116796.