CVE-2026-26226

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.

CVSS

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

15 Apr 2026, 00:35

Type	Values Removed	Values Added
Summary		(es) Las versiones de beautiful-mermaid anteriores a la 0.1.3 contienen un problema de inyección de atributos SVG que puede llevar a cross-site scripting (XSS) al renderizar diagramas de Mermaid controlados por el atacante. Los valores controlados por el usuario de las directivas de estilo y classDef de Mermaid se interpolan en los valores de los atributos SVG sin un escape adecuado, permitiendo que una entrada manipulada escape de un contexto de atributo e inyecte elementos/atributos SVG arbitrarios en la salida renderizada. Cuando el SVG generado se incrusta en una página web, esto puede resultar en la ejecución de scripts en el contexto del origen de incrustación.

13 Feb 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-02-13 17:16

Updated : 2026-07-14 16:16

NVD link : CVE-2026-26226

Mitre link : CVE-2026-26226

CVE.ORG link : CVE-2026-26226

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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