An issue was discovered in Kentico 12.0.x before 12.0.15, 11.0.x before 11.0.48, 10.0.x before 10.0.52, and 9.x versions. Due to a failure to validate security headers, it was possible for a specially crafted request to the staging service to bypass the initial authentication and proceed to deserialize user-controlled .NET object input. This deserialization then led to unauthenticated remote code execution on the server where the Kentico instance was hosted.
https://devnet.kentico.com/download/hotfixes#securityBugs-v12
http://packetstormsecurity.com/files/157588/Kentico-CMS-12.0.14-Remote-Command-Execution.html