While the error only affected a "very low number" of accounts, people were still able to access the same personal information as authorized users of an account, according to Patricia Wexler, a spokeswoman for the bank. The glitch affected users between 6:30 p.m. EST to 9 p.m. EST.
While the bank was not able to say whether any erroneous transfers occurred from the account, Wexler said the bank would work with customers if that were to happen. She also reiterated to CNBC that the situation was a glitch and not a hack. And, as a result of the glitch, many customers took to Twitter and Reddit to complain.
The news comes about a month after the bank faced a backlash from customers after its website and mobile app went down. According to news in American Banker, JPMorgan only reported the outage, and didn't offer the reason behind the glitch.
That situation resulted in criticism on the part of affected customers, who then turned to Twitter to vent. They reported that, in addition to online and mobile banking, systems at branches were also impacted. JPMorgan didn’t provide comment to American Banker.
“On January 17, an internal processing error caused temporary double posting of some items, impacting some customers. The issue was corrected overnight, and customers should now see their correct balances,” Wells Fargo said in an emailed statement, according to Reuters.
While Wells Fargo did not reveal how many customers were affected, several of those customers blasted the bank in interviews.