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Severity: high

Cross-Site Scripting



All versions of react-marked-markdown are vulnerable to cross-site scripting (XSS) via href attributes. This is exploitable if user is provided to react-marked-markdown

Proof of concept:

import React from 'react'
import ReactDOM from 'react-dom'
import { MarkdownPreview } from 'react-marked-markdown'

markedOptions={{ sanitize: true }}
value={'[XSS](javascript: alert`1`)'}


No fix is currently available for this vulnerability. It is our recommendation to not install or use this module at this time if you allow user input into href values.

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Advisory timeline

  1. published

    Advisory published
    May 17th, 2018
  2. reported

    May 17th, 2018