In July, Wendy's, which is based in Dublin, Ohio, confirmed hackers obtained customer payment card data at 1,025 of its restaurants nationwide.

“Industry sources estimate the fraudulent charges have been even greater than in other recent data breaches, like Target and Home Depot. CUNA surveys found credit unions alone were hit with nearly $60 million in costs after Home Depot's 2014 data breach and $30.6 million after Target's 2013 data breach,” CUNA said in a statement regarding its decision to join the suit.

For some, joining the suit is also a way to push for new laws that make retailers responsible for damages associated with data breaches.

“Until retailers are forced to invest in robust data security measures, credit unions will continue to pay the price for retailer data breaches,” Michigan Credit Union League EVP/COO Ken Ross said. “Adding our name to this class action is one way we are going to bat for Michigan credit unions until a legislative solution is achieved.”

The original complaint alleged that the breach was caused by malware on the company's point-of-sale systems that stole Track 1 and Track 2 data. That data normally includes cardholder names, primary account numbers, card expiration dates and sometimes PIN numbers, the complaint said. According to a Visa CAMS alert cited in the filing, the exposure window for the data breach ran from Oct. 26, 2015 through March 10, 2016.

The breach resulted in the credit union and thousands of other card issuers having to cancel and reissue compromised cards, change or close accounts, notify cardholders their cards were compromised, investigate claims of fraudulent activity, increase fraud monitoring activities, as well as reimburse cardholders for fraudulent charges, according to the complaint.

The 19 credit unions include:

• Alcoa Community Federal Credit Union (Benton, Ark., $40.9 million, 6,500 members)
• Align Credit Union (Lowell, Mass., $555 million, 27,700 members)
• AOD Federal Credit Union (Oxford, Ala., $280 million, 32,400 members)
• Associated Credit Union (Norcross, Ga., $1.4 billion, 162,900 members)
• Envista Credit Union (Topeka, Kan., $314 million, 38,300 members)
• Financial Horizons Credit Union (Hawthorne, Nev., $165 million, 11,000 members)
• First Choice Federal Credit Union (New Castle, Penn., $44 million, 6,400 members)
• Greater Cincinnati Credit Union (Cincinnati, Ohio, no member/asset size available)
• Greenville Heritage Federal Credit Union (Greenville, S.C., $88 million, 13,000 members)
• Kemba Federal Credit Union (Gahanna, Ohio, $1 billion, 87,200 members)
• Members Choice Credit Union (Houston, $519 million, 39,800 members)
• Navigator Credit Union (Pascagoula, Miss., $326 million, 47,700 members)
• North Jersey Federal Credit Union (Totowa, N.J., $226 million, 26,200 members)
• Nusenda Credit Union (Albuquerque, N.M., $1.8 billion, 164,000 members)
• Preferred Credit Union (Grand Rapids, Mich., $162 million, 24,900 members)
• South Florida Educational Federal Credit Union (Miami, $1 billion, 75,000 members)
• Tech Credit Union (Crown Point, Ind., $335 million, 38,000 members)
• Veridian Credit Union (Waterloo, Iowa, $3 billion, 200,000 members)
• Wright-Patt Credit Union (Beavercreek, Ohio, $3.3 billion, 324,000 members)

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