The Oracle WebLogic WLS-WSAT Component (versions 188.8.131.52.0 and prior) is vulnerable to a XML Deserialization remote code execution vulnerability. Malicious input passed to the XMLDecoder constructor and read functions within the WorkContextXmlInputAdapter class result in the deserialization of an arbitrary Java serialized object. Unauthenticated attackers can exploit it to remotely execute arbitrary code.
Oracle released a Critical Patch Update that fixes this issue. To fix this vulnerability it's recommended to install the Oracle Critical Patch Update from the References section.