CVE-2025-54880

MEDIUM
Published Aug 19, 2025 Modified Oct 20, 2025 CWE-79

Description

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.

Is your site exposed to CVE-2025-54880?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

6.1
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor Product
mermaid_project mermaid

References

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2025-54880? +
CVE-2025-54880 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2025-54880? +
CVE-2025-54880 affects products from mermaid_project, specifically: mermaid. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-54880? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2025-54880 — free, no signup required.