Kentico CMS before 13.0.66 has an Insecure Direct Object Reference vulnerability. It allows an attacker with user management rights (default is Administrator) to export the user options of any user, even ones with higher privileges (like Global Administrators) than the current user. The exported XML contains every option of the exported user (even the hashed password).
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.