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Servers and applications

CVE-2020-5809

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.

Severity
Medium 5.4
Published
30 Dec 2020
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Umbraco CMSServers and applications · cpe:a:umbraco:umbraco_cms
  • Every version up to 8.9.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-5809
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-5809