CVE-2025-54880 — Cross-site Scripting in Project Mermaid

CWE-79 — Cross-site ScriptingCWE-1395 — Dependency on Vulnerable Third-Party Component7 documents4 sources
Severity
5.1MEDIUMNVD
EPSS
0.0%
top 99.25%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Gogs.io GogsMermaid Project MermaidMermaid-js Mermaid+1 more
Timeline
PublishedAug 19
Latest updateFeb 6

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.

CVSS vector

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

Affected Packages5 packages

▶NVDmermaid_project/mermaid11.1.0 — 11.10.0
▶npmmermaid_project/mermaid11.1.0 — 11.10.0
▶CVEListV5mermaid-js/mermaid>= 11.1.0, < 11.10.0
▶Gogogs.io/gogs< 0.13.4

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

5
OSV
Gogs vulnerable to Stored XSS via Mermaid diagrams↗2026-02-06
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GHSA
Gogs vulnerable to Stored XSS via Mermaid diagrams↗2026-02-06
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OSV
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 d↗2025-08-19
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GHSA
Mermaid does not properly sanitize architecture diagram iconText leading to XSS↗2025-08-19
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OSV
Mermaid does not properly sanitize architecture diagram iconText leading to XSS↗2025-08-19
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📋Vendor Advisories

1
Debian
CVE-2025-54880: node-mermaid - Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-i...↗2025
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