PolicyKit 0.103 sets the AdminIdentities to "wheel" by default, which allows local users in the wheel group to gain root privileges without authentication.

Race condition in the pkexec utility and polkitd daemon in PolicyKit (aka polkit) 0.96 allows local users to gain privileges by executing a setuid program from pkexec, related to the use of the effective user ID instead of the real user ID.

pkexec.c in pkexec in libpolkit in PolicyKit 0.96 allows local users to determine the existence of arbitrary files via the argument.

Format string vulnerability in the grant helper (polkit-grant-helper.c) in PolicyKit 0.7 and earlier allows attackers to cause a denial of service (crash) and possibly execute arbitrary code via format strings in a password.