T-online.de Leak Raises Identity Theft Risk: 37,859 Records

HEROIC analysts identified a stealer log dump tied to "t-online.de," uploaded to a Telegram channel on 23-Jun-2026. The file contained 37,859 records, including email addresses, plaintext passwords, and the URLs of the sites where those logins were used.

Why This T-online.de Leak Raises Identity Theft Risk

At this scale, tens of thousands of email and password pairs sitting in plaintext give attackers a large pool of accounts to try breaking into, and each successful login is an opening to gather more personal details, such as full names, addresses, or payment information stored on other services. That accumulated information is exactly what fuels identity theft, where someone uses pieces of your identity to open accounts, make purchases, or commit fraud in your name.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the websites tied to each login

Why This Matters

Because the passwords are unencrypted and matched to specific sites, this data enables immediate account takeover on any service where the credentials remain valid. If any of these passwords were reused on banking or shopping accounts, attackers can use credential stuffing to gain access and pull together enough personal information to commit identity theft or financial fraud.

How Stealer Logs Work

Stealer log malware infects a device, often through a fake download or malicious attachment, and quietly records saved passwords, autofill data, and browser session details as they are typed. The results are compiled into a log file and sold or shared on Telegram channels and dark web forums, often in bulk batches like this one.

Check If You Are Affected

If you use a t-online.de email address, use HEROIC's free breach scanner to check whether your credentials appear in this or any other leak. It searches a database of more than 400 billion breached and leaked records to show you instantly if your information has been exposed.