GHSA-6X64-9X62-F2GX Mermaid allows CSS injection applying to sibling elements of the diagram

Summary Mermaid does not fully restrict CSS to the rendered SVG subtree. Although selectors are prefixed with mermaid-X, sibling and + combinators can still escape the Mermaid container and inject styles to DOM elements adjacent to the diagram . Most users of mermaid would not be affected by this...

CVE-2026-50159 Mermaid allows CSS injection applying to sibling elements of the diagram

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 c...

CVE-2026-50159

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 c...

CVE-2026-50159 Mermaid allows CSS injection applying to sibling elements of the diagram

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 c...

CVE-2026-50159

Mermaid (JavaScript diagram tool) is affected by a CSS-injection vulnerability caused by sibling combinator selectors generated from diagram-supplied class or id names. The issue exists prior to Mermaid v10.9.8 and v11.16.1 and can allow an attacker who supplies diagram text to inject CSS into th...