Onet.pl Leak: 2,714 Records Circulated on Telegram Since June

Since June 2026, a stealer log file tied to onet.pl accounts has been circulating on Telegram, and HEROIC analysts have logged 2,714 records inside it. Onet.pl is one of Poland's largest web portals, offering email and other services to millions of users, which makes any leak connected to it worth watching closely even at this more modest scale. The file included email addresses, plaintext passwords, and the URLs of the login pages those credentials were used on.

Why This Is Dangerous

The longer a stealer log like this stays in circulation, the more people get a chance to download and use it, since Telegram channels often pass files like this around long after they were first captured. Because the 2,714 passwords here are stored in plaintext and matched to their exact login URL, no extra work is required before an attacker can attempt to sign in as the real account holder.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the associated login pages

Why This Matters

An onet.pl email account can be tied to password resets, personal messages, and other services linked through the same login. If any of these 2,714 credentials are still active, the account owner faces a real risk of account takeover, and the risk grows if the same password protects other accounts elsewhere, since attackers routinely test stolen logins across unrelated sites through credential stuffing.

How Stealer Logs Work

Stealer logs come from malware that infects a device, often through pirated software, fake browser updates, or malicious email attachments. Once active, it quietly harvests saved passwords, autofill data, and login sessions straight from the browser, then sends everything back to whoever controls it. Files like this onet.pl dump often keep circulating on Telegram channels and dark web forums well after the initial theft, giving new buyers or downloaders fresh opportunities to use credentials that may still be valid.

Check If You Are Affected

If you have an onet.pl account, it is worth checking whether your credentials appear in this leak or any other. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including stealer logs like this one, so you can see your exposure and secure your account before someone else does.