CVE-2025-54881 — Cross-site Scripting in Project Mermaid

CWE-79 — Cross-site Scripting5 documents4 sources
Severity
5.3MEDIUMNVD
EPSS
0.0%
top 96.72%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mermaid Project MermaidMermaid-js MermaidDebian Node-mermaid
Timeline
PublishedAug 19

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 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.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Affected Packages3 packages

▶npmmermaid_project/mermaid11.0.0-alpha.1 — 11.10.0+1
▶CVEListV5mermaid-js/mermaid>= 10.9.0-rc.1, <= 11.9.0

🔴Vulnerability Details

3
OSV
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 d↗2025-08-19
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OSV
Mermaid improperly sanitizes sequence diagram labels leading to XSS↗2025-08-19
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GHSA
Mermaid improperly sanitizes sequence diagram labels leading to XSS↗2025-08-19
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📋Vendor Advisories

1
Debian
CVE-2025-54881: node-mermaid - Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-i...↗2025
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