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netlify-cms-widget-markdown@2.11.3 vulnerabilities

Widget for editing markdown in Netlify CMS.

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Direct Vulnerabilities

Known vulnerabilities in the netlify-cms-widget-markdown package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability Vulnerable Version
  • M
Cross-site Scripting (XSS)

netlify-cms-widget-markdown is a markdown package for netlify-cms.

Affected versions of this package are vulnerable to Cross-site Scripting (XSS). It is possible to insert malicious JavaScript when creating a post using the markdown editor feature. This malicious JavaScript is then stored within the application and is executed when a user visits this webpage.

PoC

https://cms-demo.netlify.com/#/collections/posts/new
Switch to markdown mode in edtior.
Paste the following in to the editor <img src="foobar.png" onerror="alert('hello')">
See the alert dialog.

How to fix Cross-site Scripting (XSS)?

Upgrade netlify-cms-widget-markdown to version 2.12.9 or higher.

<2.12.9
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