CVE-2020-5809: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

December 30, 2020 (updated January 4, 2021)

A stored XSS vulnerability exists in Umbraco CMS. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.

References

nvd.nist.gov/vuln/detail/CVE-2020-5809
www.tenable.com/security/research/tra-2020-59

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