XSS in Mermaid-js Mermaid
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…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.004 (28.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Mermaid-js Mermaid — versions >= 11.1.0, < 11.10.0
- Mermaid_project Mermaid
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-54880?
- CVE-2025-54880 is a medium-severity vulnerability in Mermaid-js Mermaid, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-08-19.
- How severe is CVE-2025-54880?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2025-54880 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.