Los Angeles-based fashion retailer Forever 21 informed customers last week that some of its payment processing systems had been infected with malware for a period of more than 7 months.

The company learned about the breach in mid-October after being alerted by a third party, and customers were first notified on November 14.

Forever 21 operates over 800 stores in 57 countries around the world, and it’s the 5th largest specialty retailer in the United States. The firm has yet to provide information on which stores are affected. It’s still working on determining if stores outside the U.S. are impacted as they use a different payment processing system, but reassured customers that its website, forever21.com, has not been breached.

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