CVE-2025-54880: Mermaid Project Mermaid

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mermaid Project Mermaid: from 11.1.0, before 11.10.0 (fixed in 11.10.0)

Published 2025-08-19. Last modified 2026-06-17.