Vulnerability Description
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid is vulnerable to CSS injection via sibling combinator selectors generated from diagram-supplied class or id names. An attacker who can supply diagram text can inject arbitrary CSS into the rendered page, potentially altering the appearance or behavior of unrelated page elements. This issue is fixed in versions 10.9.8 and 11.16.1.
Related Weaknesses (CWE)
References
- https://github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5
- https://github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266
- https://github.com/mermaid-js/mermaid/pull/8022
- https://github.com/mermaid-js/mermaid/releases/tag/[email protected]
- https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx
FAQ
What is CVE-2026-50159?
CVE-2026-50159 is a documented vulnerability. Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.8 and 11.16.1, Mermaid is vulnerable to CSS injection via sibling combinator selec...
How severe is CVE-2026-50159?
CVSS scoring is not yet available for CVE-2026-50159. Check NVD for updates.
Is there a patch for CVE-2026-50159?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.