CVE-2026-73156 cti-transmute Sunburst and Treemap Tooltips Allow Cross-Site Scripting via Crafted Conversion Data
Attackers can inject malicious scripts into Sunburst and Treemap tooltips via crafted STIX or MISP data, leading to code execution when users hover over slices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-73156?
CVE-2026-73156 is a medium-severity cross-site scripting vulnerability in MISP cti-transmute, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Affected versions of cti-transmute fail to HTML-escape attacker-controlled values used in ECharts Sunburst and Treemap tooltip formatters. Slice names may originate directly from STIX or MISP data, including STIX types, relationship_type, pattern prefixes, and MISP category/type values. Since ECharts interprets the formatter return value as HTML, crafted values can inject markup or script-capable content into the tooltip.
An attacker who can cause malicious conversion data to be processed can therefore inject content that executes when another user views the visualization and hovers over the affected slice. The patch replaces direct interpolation with dedicated formatter functions that call escapeHtml() on p.name, p.data.value, and p.value.
Weakness: CWE-79
Which versions are affected by CVE-2026-73156?
How do I fix CVE-2026-73156?
No fix has been published for CVE-2026-73156 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-73156 being exploited?
There is no known exploitation of CVE-2026-73156 in the wild and no public exploit code.
Sources
Also known as GHSA-fq55-48v3-mc95.