Bug 2563070 (CVE-2026-118244)

Summary: CVE-2026-118244 highcharts: Highcharts: Cross-site scripting via unsanitized markup fallback during chart redraw
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. An attacker can execute arbitrary script via cross-site scripting (XSS) by supplying malicious HTML markup in chart text options, such as titles or labels. When a chart is redrawn during a print event in certain browsers, an error causes Highcharts to bypass its sanitization allowlist and assign raw markup directly to the document. Consequently, embedded event handlers run in the victim's browser within the context of the hosting page, potentially leading to unauthorized actions or data disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-28 17:52:06 UTC 
Highcharts JS is a JavaScript charting library based on SVG. From 12.0.0 until 12.6.1 and 13.1.0, Highcharts falls back to assigning raw markup to innerHTML when DOMParser cannot return a document, before its allow-list is applied. In Chromium, the Trusted Types callback can throw while a beforeprint handler runs, so a page that redraws a chart during beforeprint can insert untrusted HTML text options into the hosting document. Event handlers in that markup then run in the page origin when printing begins. The issue affects HTML-rendered titles, labels, data labels, responsive text, and the Stock, Maps, and Gantt products shipped in the same package. This issue is fixed in 12.6.1 and 13.1.0.