This indicates an attack attempt to exploit a Cross-Site Scripting vulnerability in Smart Viewer in Samsung Web Viewer for Samsung DVR.
The vulnerability is due to insufficient sanitizing of user-supplied inputs in the application. A remote attacker may be able to exploit this to execute arbitrary script code within the context of the application.
Smart Viewer in Samsung Web Viewer for Samsung DVR
System Compromise: Remote attackers can execute arbitrary script code in the context of the affected system.
Currently we are not aware of any vendor supplied patch for this issue.