T-Mobile users saw other customers’ personal data due to “system glitch”

Enlarge / A T-Mobile sign on a storefront on August 24, 2023 in Washington, DC. (credit: Getty Images | Anna Moneymaker )

A T-Mobile mistake during an overnight technology update resulted in some customers seeing the private information of other users today. T-Mobile users posting on social media said they saw other customers' billing details instead of their own during the incident that reportedly lasted for three hours or so this morning.

When contacted by Ars today, T-Mobile confirmed the problem and said it was caused by a faulty update. "There was no cyberattack or breach at T-Mobile," a company spokesperson said. "This was a temporary system glitch related to a planned overnight technology update involving limited account information for fewer than 100 customers, which was quickly resolved."

As The Verge wrote, T-Mobile customers "reported that they're able to see other users' account data—including their current credit balance, purchase history, credit card information, and home address—when signing into their own T-Mobile accounts."