Vulnerability Description
beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping, allowing crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin.
Related Weaknesses (CWE)
References
- https://github.com/lukilabs/beautiful-mermaid/pull/8
- https://github.com/lukilabs/beautiful-mermaid/releases/tag/v0.1.3
- https://neo.projectdiscovery.io/share/cec71dc7-a8eb-417e-b8b4-666644796c1e
- https://www.vulncheck.com/advisories/beautiful-mermaid-svg-attribute-injection
FAQ
What is CVE-2026-26226?
CVE-2026-26226 is a documented vulnerability. beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled valu...
How severe is CVE-2026-26226?
CVSS scoring is not yet available for CVE-2026-26226. Check NVD for updates.
Is there a patch for CVE-2026-26226?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.