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EUVD-2026-250164

fkie_cve-2025-54880

Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. In the default configuration of mermaid 11.9.0 and earlier, user supplied input for architecture diagram icons is passed to the d3 html() method, creating a sink for cross site scripting. This vulnerability is fixed in 11.10.0.

GHSA-8gwm-58g9-j8pw — Mermaid does not properly sanitize architecture diagram iconText leading to XSS

Affected: npm: mermaid

### Summary In the default configuration of mermaid 11.9.0, user supplied input for architecture diagram icons is passed to the d3 `html()` method, creating a sink for cross site scripting.

### Details Architecture diagram service `iconText` values are passed to the d3 `html()` method, allowing malicious users to inject arbitrary HTML and cause XSS when mermaid-js is used in it's default configuration.

The vulnerability lies here:

```ts export const drawServices = async function ( db: ArchitectureDB, elem: D3Element, services: ArchitectureService[] ): Promise<number> { for (const service of services) { /** ... **/ } else if (service.iconText) { bkgElem.html( `<g>${await getIconSVG('blank', { height: iconSize, width: iconSize, fallbackPrefix: architectureIcons.prefix })}</g>` ); const textElemContainer = bkgElem.append('g'); const fo = textElemContainer .append('foreignObject') .attr('width', iconSize) .attr('height', iconSize); const divElem = fo .append('div') .attr('class', 'node-icon-text') .attr('style', `height: ${iconSize}px;`) .append('div') .html(service.iconText); // <- iconText passed into innerHTML /** ... **/ }; }; ```

This issue was introduced with 734bde38777c9190a5a72e96421c83424442d4e4, around 15 months ago, which was released in [v11.1.0](https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.1.0).

### PoC Render the fol…

UBUNTU-CVE-2025-54880

Affected: Ubuntu:22.04:LTS: node-mermaid