CVE-2025-54881

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 10.9.0-rc.1 to 11.9.0, user supplied input for sequence diagram labels is passed to innerHTML during calculation of element size, causing XSS.

Score

CVSS 4.0 5.3 Medium

Status

Deferred - security-advisories@github.com

Published

2025-08-19

Last modified

2025-08-19

Weaknesses

CWE-79

Affected products

• Mermaid (Mermaid-js)

References

• https://github.com/mermaid-js/mermaid/commit/5c69e5fdb004a6d0a2abe97e23d26e223a059832
• https://github.com/mermaid-js/mermaid/commit/685516a85ec1df64cefd4fd15f26533be87d458e
• https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh