Date: 
Wednesday, Oct 14th, 2026
Advisory ID: 
BACKDROP-SA-CORE-2026-009
Security risk: 
Moderately Critical
Vulnerability: 
Information Disclosure
Versions affected: 
  • Backdrop Core 1.35.x versions prior to 1.35.2
  • Backdrop Core 1.34.x versions prior to 1.34.6

Backdrop versions 1.33 and prior do not receive security coverage.

Description: 

A token is a small placeholder string (like [node:title] or [user:name]) used to automatically insert dynamic data into text. A browser is provided for selecting tokens by type.

Backdrop CMS doesn't sufficiently limit access to the types of tokens that are available in the token browser. The names of the individual tokens are adequately protected.

A CVE has been requested, and this page will be updated as soon as an official number has been issued.

Solution: 

Update your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.35.2 release page. See the update instructions.

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