This indicates an attack attempt to exploit multiple vulnerabilities in JCE Joomla! extension.
This issue is caused by a lack of sanitizing the user input that is passed to "index.php". It may allow remote attackers to execute arbitrary script via a crafted http request.
Versions lower than JCE 2.0.11 or JCE 18.104.22.168
System Compromise: Remote attackers can execute arbitrary script code in the context of the affected site.
Upgrade to the latest version,available from the web site.