Unauthorized access of employee email accounts


In March 2020, the company disclosed a security incident which they described as a 'malicious attack' against their email vendor and led to unauthorized access to certain employee email accounts which contained customer and employee information.

The information believed to have been compromised included customer names and addresses, phone numbers, account numbers, rate plans, features and billing information. Financial information (including credit card information) and Social Security numbers were confirmed by the company to have not been breached.

Free consultation

Want to discuss this case? We're offering a FREE 20 minute phone consultation with our analysts to discuss this case and the implications it has for your organisation. Just select the time and date that works for you:


  • T-Mobile
  • T-Mobile International AG

We've done the analysis so you can make the decisions

When purchasing a minimum of 5 Case Studies
$699.99 if buying less than 5.

  • Detailed cause & effect analysis
  • Lessons learnt catalogued
  • Preventive controls extracted
Add to Cart
Heads up! Want to try before you buy? You can download our FREE demo case study here