Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
npm	mermaid	>=11.0.0-alpha.1 <11.16.1 \|\| >=0 <10.9.8	11.16.1, 10.9.8

Aliases

1. CVE-2026-501592. NVD-2026-501593. OSV-2026-501594. GHSA-6x64-9x62-f2gx5. GCVE-2026-50159

References

1. https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx2. https://github.com/mermaid-js/mermaid/pull/80223. https://github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5266ed4. https://github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266f4c5e5. https://github.com/mermaid-js/mermaid/releases/tag/[email protected]6. https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8

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