This indicates an attack attempt to exploit an Insecure Deserialization vulnerability in OpenMRS.
A remote, unauthenticated attacker could exploit this vulnerability by sending a malicious HTTP request containing a crafted XML payload to the REST API endpoint. Successful exploitation of this vulnerability could result in arbitrary code execution in the context of the server application.
OpenMRS OpenMRS Platform 1.11.8 to 1.11.9
OpenMRS OpenMRS Platform 1.12.x to 1.12.1
OpenMRS OpenMRS Platform 2.0.x to 2.0.8
OpenMRS OpenMRS Platform 2.1.x to 2.1.4
OpenMRS OpenMRS Reference Application 2.6.x to 2.6.2
OpenMRS OpenMRS Reference Application 2.7.x to 2.7.2
OpenMRS OpenMRS Reference Application 2.8.x to 2.8.1
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: