CVE-2026-50159

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.

References

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx

https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8

https://github.com/mermaid-js/mermaid/releases/tag/[email protected]

https://github.com/mermaid-js/mermaid/pull/8022

https://github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266f4c5e

https://github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5266ed

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS