beautiful-mermaid contains an SVG attribute injection issue that can lead to cross-site scripting (XSS)
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.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | beautiful-mermaid | < 0.1.3 | 0.1.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-26226
- https://github.com/lukilabs/beautiful-mermaid/pull/8
- https://github.com/lukilabs/beautiful-mermaid/commit/68f3ab8c9658e7f4a3b749e06a6b96e4c3f55db1
- https://github.com/lukilabs/beautiful-mermaid
- 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
- 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- Weakness (CWE)
CWE-79- Platform
- npm
- Package
beautiful-mermaid- Disclosed
- 13.02.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-cgmm-x5ww-q5cr - CC BY 4.0
Vulnerability history: beautiful-mermaid
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.