GitHub Advisoryadvisory · npm

GHSA-cgmm-x5ww-q5cr beautiful-mermaid contains an SVG attribute injection issue that can lead to cross-site scripting (XSS)

MEDIUM Published 2026-02-13 Modified 2026-02-13 Official page ↗
Aliases
CVE-2026-26226
Ecosystem
npm
Packages
beautiful-mermaid
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Weaknesses
CWE-79
Reviewed
2026-02-13

Affected packages

• npm beautiful-mermaid: < 0.1.3 → fixed in 0.1.3

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

Alias · CVE (1)

  • 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… vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References