CVE-2020-5809

MediumCVSS 5.4/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

VendorProductVersions
n/aUmbraco CMS<= 8.9.1 or current (unfixed)

References

Timeline

Published
Dec 30, 2020
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2020-5809: Medium severity, CVSS 5.4 | Vulnix