Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade keystone
to version 4.0.0-beta.7 or higher.
keystone
is an web Application Framework and Admin GUI / Content Management System built on Express.js and Mongoose.
Affected versions of the package are vulnerable to Cross-site Scripting (XSS). A cross-site scripting (XSS) vulnerability exists in fields/types/markdown/MarkdownType.js in KeystoneJS before 4.0.0-beta.7 via the Contact Us feature.
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You can read more about Cross-site Scripting (XSS)
on our blog.