Ohio Rev. Code Ann. § 5723.13

Whenever real property in this state is sold under sections 5721.01 to 5721.28, inclusive, or 5723.01 to 5723.19, inclusive, of the Revised Code, no action shall be commenced, nor shall any defense be set up to question the validity of the title of the purchasers at such sale for any irregularity, informality, or omission in the proceedings relative to the foreclosure, forfeiture, or sale, unless such action is commenced or defense set up within one year after the deed to such property is filed for record.