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How T-Mobile API attack led to 37 million customers' Data breach?

Learn how How T-Mobile API attack led to 37 million customers' Data breach.


Jaydev Ahire

2 min read


T-Mobile, one of the biggest names in the telecommunications industry, has recently suffered a data breach! An attacker stole personal information of 37 million current postpaid and prepaid customer accounts by exploiting a vulnerability in one of its APIs. The company has now made the breach public and is taking action to resolve the issue.

Timeline of the breach?

Nov 25, 2022 → Data breach began on November 25, 2022, when the attacker gained access to one of its APIs and started stealing the personal information of its customers. 

Jan 5, 2023 → The company detected malicious activity on January 5, 2023.

Jan 6, 2023 → T-Mobile swiftly took action by cutting off the attacker's access to the API within 24 hours of knowing.

We are continuing to diligently investigate the unauthorized activity. Additionally, we have begun notifying customers whose information may have been obtained by the bad actor in accordance with applicable state and federal requirements. T-Mobile

What got leaked?

Attacker stole data including customer names, addresses, emails and phone numbers, along with their account numbers and plan details. However, credit card information, passwords, government ID numbers and Social Security numbers were not part of the data accessed. 

While T-Mobile's data breach may not have resulted in the exposure of sensitive information such as driver's licenses, social security numbers, or financial account information, the personal data that was obtained by the attacker can still be used for nefarious purposes. Customer names, addresses, emails, and phone numbers, along with account numbers and plan details may seem harmless on their own, but when combined, they can be used for identity theft, social engineering attacks, and phishing scams. Hackers can use this information to impersonate T-Mobile customers, potentially accessing other accounts or stealing money. This incident serves as a reminder of the importance of protecting all types of personal information, not just sensitive data, in the digital age.

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How to protect your APIs from such Data breaches?

APIs are the gatekeepers to your sensitive data, so it's crucial to ensure they're protected against cyber attacks. With data breaches like above making headlines on a regular basis, it's more important than ever to take a proactive approach to API security. So, how can you safeguard your APIs and keep your data out of the hands of cybercriminals?

  1. First, it's essential to regularly monitor your APIs and the sensitive information being transmitted in requests and responses. This will give you a clear picture of what data is being accessed, and where potential vulnerabilities may lie.

  2. Next, make sure that any API exposed to the public and sending sensitive data in the response is properly authenticated. Implementing a continuous testing and monitoring tool, such as Akto, can send alerts immediately if a security vulnerability is detected.

  3. Proper resource management and rate limiting are also crucial in the design and implementation of an API. This can include using rate-limiting algorithms to limit the number of requests an API can receive from a single IP address or user, as well as implementing proper error handling and logging to detect and respond to potential attacks.

  4. Finally, stay up-to-date with the latest security best practices, and monitor and test your APIs for vulnerabilities regularly. 

Don't let hackers steal your sensitive data, fortify your defenses with the above API security guidelines. Quickly detect sensitive data leak from your APIs here.

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