Bug 2563053 (CVE-2026-118242)

Summary: CVE-2026-118242 highcharts: highcharts: Cross-site scripting via unsanitized grid icon attributes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin, rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Highcharts. When rendering grid icons using Scalable Vector Graphics (SVG), the library copies configuration properties directly into element attributes without proper sanitization. An attacker who controls the grid configuration can supply malicious event handlers within custom icon definitions. When a user hovers over or activates an affected icon, arbitrary script executes within their browser session, potentially enabling sensitive information disclosure or unauthorized actions.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-10-28 17:43:38 UTC 
Highcharts JS is a JavaScript charting library based on SVG. From 2.3.0 until 3.2.0, Highcharts Grid creates SVG path elements from rendering.icons object definitions and previously copied every child key with setAttribute. An attacker who controls Grid configuration can supply event-handler attribute names in an icon definition. Because custom icons override built-ins, the attacker can replace default sort or pagination icons, and script runs in the hosting page origin when a user hovers over or activates the affected icon. This issue is fixed in 3.2.0.