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A bug in T-Mobile site allowed anyone see any customer’s account details

A flaw in T-Mobile’s website allowed anyone to access the personal account details of any customer by providing their mobile number.

The bug discovered by the researcher Ryan Stevenson residesin the T-Mobile subdomainpromotool.t-mobile.comused by the staff as a customer care portal to access the company’s internal tools. subdomain contained a hidden API that would return customer data simply by invoking it with the customer’s cell phone number as a parameter.

The data leak was caused by the lack of any authentication mechanism for calling the API, in this way anyone could have had access to any customer record includingfull name, postal address, billing account number, and in some cases information about tax identification numbers.

The exposed records also included references to account PINs used by customers as a security question when they contact the customer case, this means that an attacker could use that information to impersonate a customer...(continued)

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