Date: 
Wednesday, Oct 10th, 2018
Advisory ID: 
BACKDROP-SA-CORE-2018-005
Security risk: 
Moderately Critical
Vulnerability: 
Cross Site Scripting
CVE ID: 
CVE-2018-1000813
Versions affected: 
  • Backdrop Core 1.x.x versions prior to 1.11.1
Description: 

Backdrop CMS doesn't sufficiently protect against XSS when allowing administrative users to define custom classes for blocks and regions. This vulnerability is mitigated by the fact that an attacker must have a role with the permission "Administer Layouts".

Solution: 

Upgrade your site to the most recent version of Backdrop core.  Download available on the Backdrop CMS 1.11.1 release page.  See the update instructions, if needed.

Reported By: 
Fixed By: 
Coordinated 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.

  1. Log in to backdropcms.org
  2. Edit your profile
  3. Switch to the "Subscriptions" tab
  4. Check the box labeled "Security updates"
  5. Save the form