Chimicles and Tikellis is one attorney that has filed suit against the company, on behalf of Amalgamated Bank, Matadors Community Credit Union, GECU, MidFlorida Federal Credit Union, and Farmers State Bank. The companies are claiming expenses to cover the cost of reissuing bank cards, along with reputational damage.

"The complaint raises claims for common law negligence, breach of contracts to which plaintiffs and class members were intended third party beneficiaries, breach of implied contract, violations of the New Jersey Consumer Fraud Act, negligence per se, and negligent misrepresentation," said the legal firm in a statement.

Other firms filing suit include Sohmer & Stark LLC, and Lone Summit Bank.

The card payment processor has still not admitted how many credit card records may have been compromised in the breach, which it discovered after credit card companies tipped it off. The breach occurred following the installation of malicious software onto its systems. It has expressed concern that card numbers, expiration dates and other data from the card’s magnetic stripe may have been exposed. In some limited cases, cardholder name information may also have been compromised.

"The investigation by forensic auditors is still underway, and we simply do not have that information. The media reports of numbers of potentially compromised accounts have been speculative," it said in a statement.

At the time of writing, the latest press release on the breaches from the payment processing company was dated 27 January and was more than a month old. It stated that the firm had begun working on end-to-end encryption systems to mitigate further risk.