T-Mobile Web Portal Bug Exposed Customer Account Data

A research conducted last month confirmed a bug in the T-Mobile customer support portal which exposed personal information including account details and PIN of its 74 million customers.


The T- mobile sub-domain has a customer care portal, “promotool.t-mobile.com”, which contained customer sensitive data is publicly accessible. This portal which is primarily used by the company staff could be easily accessed on search engine, and contained a hidden API that would return T-Mobile customer data simply by adding the customer’s cell phone number to the end of the web address.

Since the API wasn’t protected by a login screen or any other authentication protection, the portal could be easily accessed by anyone. Hence, customer’s full name, postal address, billing account number, and in some cases information about tax identification numbers could be easily retrieved.

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