Submitted by 0x52, also found by pashov and indijanc
Owner may accidentally transfer ownership to inoperable address due to perceived safeguard that doesnt exist.
WardenPledge inherits from Ownable rather than Owner, which is the intended contract. Owner overwrites the critical Ownable#transferOwnership function to make the ownership transfer process a two step process. This adds important safeguards because in the event that the target is unable to accept for any reason (input typo, incompatible multisig/contract, etc.) the ownership transfer process will fail because the pending owner will not be able to accept the transfer. To make matters worse, since it only overwrites the transferOwnership function the WardenPledge contract will otherwise function as intended just without this safeguard. It is likely that the owner wont even realize until its too late and the safeguard has failed. A perceived safeguard where there isnt one is more damaging than not having any safeguard at all.
Kogaroshi (Paladin) confirmed
