An issue was discovered in BeyondTrust Privilege Management for Windows through 5.6. When adding the Add Admin token to a process, and specifying that it runs at medium integrity with the user owning the process, this security token can be stolen and applied to arbitrary processes.
https://www.beyondtrust.com/trust-center/security-advisories/bt22-07
https://www.beyondtrust.com/support/changelog/privilege-management-for-windows-5-6-sr1