The Dokan WordPress plugin before 5.3.3 does not reconcile the amount credited to a vendor's reverse-withdrawal ledger against the amount actually collected for the payment order, allowing a vendor to clear their outstanding commission debt while paying less than the balance owed when a discount coupon is applied at checkout.
https://wpscan.com/vulnerability/e34bdc0e-0e33-4ffd-8edb-fef726259e04/