What is CVE-2020-5809?

CVE-2020-5809 is a stored XSS vulnerability that exists in Umbraco CMS versions <= 8.9.1 or current.

Is Umbraco CMS version 8.9.1 affected by CVE-2020-5809?

Yes, Umbraco CMS version 8.9.1 is affected by CVE-2020-5809.

How severe is the vulnerability in Umbraco CMS CVE-2020-5809?

The severity of the vulnerability in Umbraco CMS CVE-2020-5809 is medium, with a severity score of 5.4.

How can I fix the vulnerability in Umbraco CMS CVE-2020-5809?

To fix the vulnerability in Umbraco CMS CVE-2020-5809, it is recommended to update to a version higher than 8.9.1 or apply the necessary security patches.

Vulnerability/
CVE-2020-5809

medium

5.4

CWE

30/12/2020

24/5/2022

23/8/2023

CVE-2020-5809: XSS

Q: How does the vulnerability in Umbraco CMS CVE-2020-5809 work?

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

Q: Is Umbraco CMS version 8.9.1 affected by CVE-2020-5809?

Yes, Umbraco CMS version 8.9.1 is affected by CVE-2020-5809.

Q: How severe is the vulnerability in Umbraco CMS CVE-2020-5809?

The severity of the vulnerability in Umbraco CMS CVE-2020-5809 is medium, with a severity score of 5.4.

Q: How can I fix the vulnerability in Umbraco CMS CVE-2020-5809?

To fix the vulnerability in Umbraco CMS CVE-2020-5809, it is recommended to update to a version higher than 8.9.1 or apply the necessary security patches.

First published: Wed Dec 30 2020(Updated: )

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.

Credit: vulnreport@tenable.com vulnreport@tenable.com

Affected Software	Affected Version	How to fix
nuget/UmbracoCms.Core	<=8.9.1
Umbraco CMS	<=8.9.1

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Frequently Asked Questions

What is CVE-2020-5809?
CVE-2020-5809 is a stored XSS vulnerability that exists in Umbraco CMS versions <= 8.9.1 or current.
How does the vulnerability in Umbraco CMS CVE-2020-5809 work?
An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor in Umbraco CMS, as TinyMCE is configured to allow iframes by default.
Is Umbraco CMS version 8.9.1 affected by CVE-2020-5809?
Yes, Umbraco CMS version 8.9.1 is affected by CVE-2020-5809.
How severe is the vulnerability in Umbraco CMS CVE-2020-5809?
The severity of the vulnerability in Umbraco CMS CVE-2020-5809 is medium, with a severity score of 5.4.
How can I fix the vulnerability in Umbraco CMS CVE-2020-5809?
To fix the vulnerability in Umbraco CMS CVE-2020-5809, it is recommended to update to a version higher than 8.9.1 or apply the necessary security patches.

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alias/GHSA-95qr-67rx-9pgh
alias/CVE-2020-5809
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collector/nvd-index
package-manager/nuget
vendor/umbraco
canonical/umbraco cms
version/umbraco cms/8.9.1

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