Your t-online.de Login May Be in This 238,914-Record Leak

If you have ever created a t-online.de account, this is worth your attention. HEROIC analysts found a stealer log uploaded to Telegram on June 17, 2026, containing 238,914 records tied to t-online.de logins. Whether your details are among them or not, the file shows email addresses, plaintext passwords, and the URLs each login was used on, all pulled from devices already infected with information-stealing malware.

Why This Is Dangerous

You might assume a leak like this only matters to the people whose data appears in it, but the risk extends further. If you reused any of your t-online.de passwords on other accounts, someone with this file can try that same password on your email, banking, or shopping logins in minutes, since the passwords are already in plain, readable text.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs linked to each login

Why This Matters

You rely on password reuse more than you might realize, and attackers count on it. A file of 238,914 credential pairs gives them enough volume to run automated credential stuffing attacks across major platforms, testing your email and password combination until one sticks. If it works even once, they can move on to resetting your other accounts using that same email.

How Stealer Logs Work

You don't need to click anything malicious yourself for your credentials to end up in a file like this, sometimes it's malware already sitting on a shared or infected device you logged into. That malware silently copies saved logins and sends them to whoever controls it, who then compiles the data into a log and shares or sells it, in this case through a Telegram upload.

Check If You Are Affected

You don't have to guess whether your t-online.de credentials are part of this 238,914-record leak. HEROIC's free breach scanner checks your email against a database of more than 400 billion exposed records, so you can find out directly and change any password that shows up.