Poland Combolist Leak: How 660,528 Passwords Create Chained Risk

Poland Combolist: What HEROIC Analysts Found

On 06-Jul-2026, HEROIC threat analysts identified a combolist file titled "Poland" shared by a Telegram user. The file contained 660,528 records, each pairing an email address and a plaintext password with the URL of the account it unlocks. The file's name suggests the credentials inside were gathered specifically from accounts tied to Poland, making this one of the larger regionally focused leaks HEROIC has logged.

Why This Is Dangerous

A file this size turns into a chain reaction once it starts circulating. An attacker can automatically test all 660,528 email-and-password pairs against the URLs already included in the file, and every successful login opens the door to the next step: checking whether that same password unlocks the person's banking, shopping, or social media accounts elsewhere.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why This Matters

This is exactly the kind of leak that fuels large-scale credential stuffing campaigns, where attackers systematically test stolen logins against dozens of other platforms. Because the passwords here are plaintext, one exposed account can quickly chain into several more if the person reused their credentials, ultimately leading to account takeover, identity theft, or financial fraud for hundreds of thousands of people.

How Combolists Work

A combolist compiles stolen login pairs, usually an email or username alongside a password, into a single file that can be sorted, filtered, and reused by anyone who obtains it. Large combolists like this one are often built by merging smaller leaks and infections over time, then labeled by region, country, or platform to make them easier for buyers to target a specific type of victim.

Check If You Are Affected

If you have any accounts linked to Poland or have used the same password across multiple sites, it is worth finding out whether your information appears in this leak. HEROIC's free breach scanner checks your email against more than 400 billion leaked records, including large combolists like this one, so you can act before the chain reaction reaches your other accounts.