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

May 24, 2022 (updated July 13, 2023)

A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. 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

github.com/advisories/GHSA-95qr-67rx-9pgh
nvd.nist.gov/vuln/detail/CVE-2020-5809
www.tenable.com/security/research/tra-2020-59

Code Behaviors & Features

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