CVE-2026-41149— Mermaid: Improper sanitization of `classDef` in state diagrams leads to HTML injection
Possible ATT&CK Techniques 1AI
T1189 · Drive-by CompromiseAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mermaid-js | mermaid | >= 11.0.0-alpha.1, < 11.15.0 | affected |
< 10.9.6 | affected |
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I. Basic Information for CVE-2026-41149
Vulnerability Information
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Vulnerability Title
Mermaid: Improper sanitization of `classDef` in state diagrams leads to HTML injection
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and earlier, as well as 11.0.0-alpha.1 through 11.14.0, are vulnerable to HTML injection under the default configuration. Specifically, the classDef directive in Mermaid state diagrams permits DOM injection that escapes the SVG context. However, <script> tags are stripped, which prevents cross-site scripting (XSS). This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in a sandboxed <iframe>.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| mermaid-js | mermaid | >= 11.0.0-alpha.1, < 11.15.0 | - |
II. Public POCs for CVE-2026-41149
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-41149 (2)
Vendor Advisories for CVE-2026-41149 (1)
IV. Related Vulnerabilities
Same product: mermaid
- CVE-2026-41148
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Arbitrary `CSS` injection into the generated graph affecting - CVE-2021-43861
Incorrect sanitisation function leads to `XSS`
Same vendor: mermaid-js
- CVE-2026-41148
Mermaid: Improper sanitization of `classDefs` in diagrams le - CVE-2025-54881
Mermaid improperly sanitizes of sequence diagram labels lead - CVE-2025-54880
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Cross-site Scripting in ZenUML - CVE-2022-31108
Arbitrary `CSS` injection into the generated graph affecting
Same weakness: CWE-94
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