This indicates an attack attempt to exploit a Cross-Site Scripting Vulnerability in OpenMRS Reference Application.
This vulnerability is due to insufficient validation of user-supplied request parameters for the login page. A remote attacker can exploit this vulnerability by enticing a target user into clicking a malicious link. Successful exploitation could allow the attacker to execute arbitrary script code in the context of the user's browser.
OpenMRS Reference Application 2.9.0 and prior
System Compromise: Remote attackers can execute arbitrary script code in the context of the victims browser
Apply the most recent upgrade or patch from the vendor.