Joomla! Core is prone to multiple vulnerabilities, including security bypass and open redirect vulnerabilities. Exploiting these issues could allow an attacker to bypass intended access restrictions and perform otherwise restricted actions, or to redirect users to arbitrary web sites and conduct phishing attacks. Joomla! Core versions ranging from 2.5.0 and up to and including 3.10.6 are vulnerable.
Update to Joomla! Core version 3.10.7 or latest