Possibly. There are “hard cash” or “hard money” loans available, but these are high interest loans with short repayment terms. They are not suitable for anyone except experienced house flippers, whose intent it is to fix up the house as quickly as possible and resell it quickly.
However, real estate transactions are conducted pursuant to state law, and some states do allow bidders time to complete the transaction with a mortgage. Check your state’s laws as well as the rules available on the auction platform you intend to use.