The executive director of the Niagara Falls Housing Authority has come under sharp criticism in an audit by the office of State Comptroller Thomas P. DiNapoli that was released Thursday.

Auditors said that director Stephanie W. Cowart received $6,400 in improper stipends and sold back more unused vacation time than her contract allowed. They also reported that a number of other payments to Cowart were not supported with documentation and failed to comply with terms of her contract.