NodeJS/mermaid/8.0.0-alpha.4

Cross-site Scripting in Mermaid

Mermaid before 8.11.0 allows XSS when the antiscript feature is used.

Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify

The following bundled files within the Mermaid NPM package contain a bundled version of DOMPurify that is vulnerable to https://github.com/cure53/DOMPurify/security/advisories/GHSA-mmhx-hmjr-r674, potentially resulting in an XSS attack.

This affects the built:

• dist/mermaid.min.js
• dist/mermaid.js
• dist/mermaid.esm.mjs
• dist/mermaid.esm.min.mjs

This will also affect users that use the above files via a CDN link, e.g. https://cdn.jsdelivr.net/npm/mermaid@10.9.2/dist/mermaid.min.js

Users that use the default NPM export of mermaid, e.g. import mermaid from 'mermaid', or the dist/mermaid.core.mjs file, do not use this bundled version of DOMPurify, and can easily update using their package manager with something like npm audit fix.

Patches

• develop branch: 6c785c93166c151d27d328ddf68a13d9d65adc00
• backport to v10: 92a07ffe40aab2769dd1c3431b4eb5beac282b34

Incorrect sanitisation function leads to `XSS` in mermaid

Impact

Malicious diagrams can contain javascript code that can be run at diagram readers machines.

Patches

The users should upgrade to version 8.13.8

Workarounds

You need to upgrade in order to avoid this issue.

Cross-Site Scripting in mermaid

Versions of mermaid prior to 8.2.3 are vulnerable to Cross-Site Scripting. If malicious input such as A["<img src=invalid onerror=alert('XSS')></img>"] is provided to the application, it will execute the code instead of rendering it as text due to improper output encoding.

Recommendation

Upgrade to version 8.2.3 or later