The Joomla! team has been hard at work today releasing version 3.8.4, which contains multiple security updates and bug fixes. Specifically, four major security vulnerabilities were found in Joomla! core files. These vulnerabilities impact all Joomla!  versions from 1.5 to 3.7. Three of the four vulnerabilities identified were cross site scripting (XSS) vulnerabilities found in modules and components within the core application. These vulnerabilities could potentially allow attackers to inject malicious code into otherwise legitimate website files. The fourth vulnerability, a  SQL injection (SQLi) vulnerability, was identified in the post-install message and could have allowed attackers to inject malicious code into the Joomla! MySQL database.  

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