seitensprung.at Data Breach Exposes 62,440 User Credentials

HEROIC's DarkHive intelligence system discovered the seitensprung.at breach, exposing 62,440 records from this Austrian online platform. The breach occurred in March 2017 and involved plaintext password storage, meaning user passwords were retained without any cryptographic protection. The exposure of plaintext credentials from over 62,000 accounts represents a direct and immediately exploitable security incident, as these credentials required no cracking effort and were immediately available for use in unauthorized login attempts across other online services.

Why This Is Dangerous

Plaintext passwords are the most immediately exploitable form of credential exposure. Unlike hashed passwords that require cracking time, the 62,440 plaintext passwords from this breach were directly available to attackers upon data acquisition. Every affected user's exact login credentials were exposed, enabling instant credential stuffing attacks against email providers, social media platforms, banking services, and any other platform where the same email and password combination was reused. The availability of this data since 2017 means it has had years to circulate in underground markets.

What Was Exposed

• Usernames
• Plaintext Passwords

Why This Matters

Plaintext password breaches carry immediate, ongoing risk for all affected users who reused their credentials on other platforms. With direct access to user passwords rather than hashes requiring cracking, threat actors can immediately deploy these credentials in automated login attempts against other services. The 62,440-record dataset has been incorporated into combolist compilations used in credential stuffing attacks targeting email services, financial platforms, and social media networks. Users who registered on seitensprung.at before March 2017 and applied the same password elsewhere remain at risk on every service where those credentials were reused.

How Database Breaches Work

A database breach occurs when attackers exploit vulnerabilities in a web application's code, server configuration, or administrative systems to gain unauthorized access to the backend database. Storing passwords in plaintext rather than using cryptographic hashing algorithms represents a fundamental security failure that violates basic industry standards. When attackers extract a plaintext password database, every user's actual credentials are directly available with no decryption or cracking required. The stolen data is then distributed through underground forums and Telegram channels and incorporated into automated credential testing tools targeting other online services.

Check If You Are Affected

HEROIC offers a free identity scanner searching over 400 billion records including data from the seitensprung.at breach. Visit heroic.com to check if your information was exposed. If you had an account on seitensprung.at before March 2017, changing your password on every service where you used the same credentials is critical, as plaintext exposure means those exact passwords were available to attackers with no technical barrier to use.