See how sifalo pay compares to other vendors in security performance
The Sifalo Pay WordPress plugin before 2.5.3 does not verify ownership of, or authorisation for, the order being updated when it handles a payment return, allowing unauthenticated attackers to write arbitrary payment session metadata onto any order in the store and to force any order awaiting payment into a failed state.
The Sifalo Pay WordPress plugin before 2.5.3 does not verify that a payment transaction identifier belongs to the order it is confirming, nor that the requester owns that order, allowing unauthenticated attackers holding one valid transaction identifier from a payment of their own to mark arbitrary pending orders as paid.