• Project: Joomla!
  • SubProject: CMS
  • Impact: High
  • Severity: Low
  • Versions: 2.5.0 - 3.9.27
  • Exploit type: Incorrect Access Control
  • Reported Date: 2021-06-06
  • Fixed Date: 2021-07-06
  • CVE Number: CVE-2021-26038


Install action in com_installer lack the required hardcoded ACL checks for superusers, leading to various potential attack vectors. A default system is not affected cause by default com_installer is limited to super users already.

Affected Installs

Joomla! CMS versions 2.5.0 - 3.9.27


Upgrade to version 3.9.28


The JSST at the Joomla! Security Centre.

Reported By: Nicholas Dionysopoulos