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.
Severity (CVSS)
| Base score | 5.3 |
|---|---|
| Severity | Medium |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L |
| Provided by | CNA |
Weaknesses
- CWE-94 — CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected products
| Vendor | Product | Versions |
|---|---|---|
| mermaid-js | mermaid | < 10.9.8; >= 11.0.0-alpha.1, < 11.16.1 |
References
- https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx (x_refsource_CONFIRM)
- https://github.com/mermaid-js/mermaid/pull/8022 (x_refsource_MISC)
- https://github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5266ed (x_refsource_MISC)
- https://github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266f4c5e (x_refsource_MISC)
- https://github.com/mermaid-js/mermaid/releases/tag/mermaid@11.16.1 (x_refsource_MISC)
- https://github.com/mermaid-js/mermaid/releases/tag/v10.9.8 (x_refsource_MISC)
Generated from the official CVE List on 07 Aug 2026 07:02 UTC.