Computer Marketing Corp. in Sandy, Utah, provider of the FLEX platform to about 300 credit unions, found itself quickly involved in responding to the Target breach, the company said.

Considered the second largest breach ever of a retailer, the Target breach lasted from Nov. 27 to Dec. 15 and affected an estimated 40 million debit and credit cards. The largest breach was the years-long TJX breach that affected an estimated 90 million accounts before its discovery was announced in 2007.

The day after the Target breach was announced , FLEX sent an email to its user credit unions offering a customized program and report identifying affected members and including options up to a mass re-issue of cards, CMC said in a statement.

“We contacted each member inviting them to the credit union where we were able to instant-issue a new card without having to perform a mass re-issue. By Saturday at least half of the members affected had a new card in their possession,” said Kirk Mondy, president of the $40 million, 8,700-member Poplar Bluff Federal Credit Union in Poplar Bluff, Mo.

“We delivered nearly 800 letters to the post office to notify members affected in the Target breach,” said Al Frosolone, CEO of the 23,000-member, $131 million Niagara's Choice Federal Credit Union in Niagara Falls, N.Y.