Wednesday, Apr 19th, 2023
Advisory ID: 
Security risk: 
Moderately Critical
Access bypass
Versions affected: 
  • Backdrop Core 1.24.x versions prior to 1.24.2
  • Backdrop Core 1.23.x versions prior to 1.23.4

Backdrop versions 1.22 and prior do not receive security coverage.


File downloads do not sufficiently sanitize file paths in certain situations. This may result in people gaining access to private files to which they should not have access.

Some sites may require configuration changes following this security release. Review the release notes if you have issues accessing private files after updating.

  • All Backdrop sites running on Windows web servers are vulnerable.
  • Backdrop sites on Linux web servers are vulnerable only with certain file directory structures, or if a vulnerable contributed or custom file access module is installed.



Upgrade your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.24.2 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.

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