Cross-site request forgery (CSRF) vulnerability in the com_templates component in Joomla! 3.2.0 through 3.3.x and 3.4.x before 3.4.6 allows remote attackers to hijack the authentication of unspecified victims via unknown vectors.
https://developer.joomla.org/security-centre/633-20151214-core-csrf-hardening.html