CVE-2025-54881
August 19, 2025
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.
Affected Packages
mermaid (CDN_JS):
Affected version(s) >=10.9.0-rc.1 <10.9.4Fix Suggestion:
Update to version 10.9.4mermaid (CDN_JS):
Affected version(s) >=10.9.0-rc.1 <11.10.0Fix Suggestion:
Update to version 11.10.0mermaid (CDN_JS):
Affected version(s) >=11.0.0-alpha.1 <11.10.0Fix Suggestion:
Update to version 11.10.0https://github.com/mermaid-js/mermaid.git (GITHUB):
Affected version(s) >=mermaid@11.0.1 <mermaid@11.10.0Fix Suggestion:
Update to version mermaid@11.10.0mermaid (NPM):
Affected version(s) >=11.0.0-alpha.1 <11.10.0Fix Suggestion:
Update to version 11.10.0mermaid (NPM):
Affected version(s) >=10.9.0-rc.1 <10.9.4Fix Suggestion:
Update to version 10.9.4mermaid (NPM):
Affected version(s) >=10.9.0-rc.1 <11.10.0Fix Suggestion:
Update to version 11.10.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.01
