Wednesday, Mar 16th, 2022
Advisory ID: 
Security risk: 
Moderately Critical
  • Cross Site Scripting
  • Third Party Libraries
Versions affected: 
  • Backdrop Core 1.21.x versions prior to 1.21.4
  • Backdrop Core 1.20.x versions prior to 1.20.7

Backdrop versions 1.19 and prior do not receive security coverage.


The Backdrop project uses the CKEditor library for rich-text editing. CKEditor has released a security update that impacts Backdrop.

If a Backdrop site is configured to use CKEditor for rich-text editing, an attacker that can create or edit content (even without access to CKEditor themselves) may be able to exploit one or more Cross-Site Scripting (XSS) vulnerabilities. Victims may be people who later edit that content using CKEditor, including site admins with privileged access.

For more information, see CKEditor's security advisories:



Upgrade your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.21.4 release page. See the update instructions, if needed.

Reported By: 
Fixed By: 

Security email list

Backdrop maintains a security mailing list. Whenever a security release comes out, an email will be sent to everyone subscribed to that list, announcing the new release. Please follow the steps below to join the Security email list.

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