JPMorgan Chase & Co, an American multinational banking and financial services holding company, has issued warning to around 465,000 card users regarding a security breach that might have allowed hackers to steal personal information.


According to the Reuters, the cyber attack happened back in July on their UCARD website "www.ucard.chase.com". However, the breach was only detected in the mid-September.


The company says the personal info of customers are encrypted. However, during the cyber attack, some data temporarily "appeared in plain text in files the computers use to log activity".


Though small amount of data was accessed, the company found no evidence showing that sensitive data such social security number, email id,date of birth were compromised.


Only Ucard users are affected by this security breach, others are not affected. Affected customers are being offered free credit-monitoring services for one year.