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CVE-2026-73156 is a stored cross-site scripting vulnerability in CTI-Transmute affecting versions 1.4 and earlier. The flaw is caused by failure to HTML-escape attacker-controlled values before inserting them into ECharts Sunburst and Treemap tooltip formatter output. Values used as slice names can be derived directly from converted STIX or MISP content, including STIX object types, relationship_type values, pattern prefixes, and MISP category or type fields. Because ECharts interprets the formatter return value as HTML, crafted conversion data can inject arbitrary markup or script-capable content into rendered tooltips. The issue is triggered when a user opens the affected visualization and hovers over a malicious slice. The patch replaces direct string interpolation with dedicated formatter functions that apply HTML escaping to tooltip fields before rendering.
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