CVSS 4.0
5.3 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:LCVE-2026-41149
Medium (5.3). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in mermaid 10.9.6, 11.15.0.
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>.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-31)
- CWE
- CWE-94
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-ghcm-xqfw-q4vr | npm | mermaid | >=11.0.0-alpha.1 <11.15.0 | 11.15.0 |
| GHSA-ghcm-xqfw-q4vr | npm | mermaid | <10.9.6 | 10.9.6 |
References
- https://github.com/mermaid-js/mermaid/commit/37ff937f1da2e19f882fd1db01235db4d01f4056
- https://github.com/mermaid-js/mermaid/commit/4e2d512bf5bf6f9de1a8f0a48da78dc4d09ac4f3
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr