CVE-2025-54881— Mermaid improperly sanitizes of sequence diagram labels leading to XSS
Quick assessment
Affected
mermaid-js mermaid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mermaid是mermaid-js开源的一个应用软件。使用文本和代码创建图表和可视化。 Mermaid 10.9.0-rc.1版本至11.9.0版本存在跨站脚本漏洞，该漏洞源于用户输入的序列图标签传递给innerHTML，可能导致跨站脚本。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-54881
Vulnerability Information
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Vulnerability Title
Mermaid improperly sanitizes of sequence diagram labels leading to XSS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Mermaid 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mermaid是mermaid-js开源的一个应用软件。使用文本和代码创建图表和可视化。 Mermaid 10.9.0-rc.1版本至11.9.0版本存在跨站脚本漏洞，该漏洞源于用户输入的序列图标签传递给innerHTML，可能导致跨站脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| mermaid-js | mermaid | >= 10.9.0-rc.1, <= 11.9.0 | - |
|
II. Public POCs for CVE-2025-54881
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-54881 (1)
IV. Related Vulnerabilities
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Same vendor: mermaid-js
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CVE-2026-71439
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Mermaid allows CSS injection applying to sibling elements of -
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Same weakness: CWE-79
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V. Comments for CVE-2025-54881
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