CVE-2020-5809

Published: Dec 30, 2020Modified: Jun 17, 2026

5.4

Vector

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

Exploitability: 2.3 / Impact: 2.7

Source: NVD

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.

Affected (1)

Products: Umbraco: Umbraco Cms

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Umbraco Umbraco Cms	Up to 8.9.1

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (2)

https://www.tenable.com/security/research/tra-2020-59

Source: vulnreport@tenable.com

ExploitThird Party Advisory

https://www.tenable.com/security/research/tra-2020-59

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitThird Party Advisory

Timeline

No history available yet.