The 4.1K Combo List: 3,532 Valid Email and Password Pairs Leaked

The 4.1K Combo List: 3,532 Valid Email and Password Pairs Leaked

HEROIC analysts identified a file labeled 4.1K Mix Combo List Full Valid, uploaded to a Telegram channel on 15 June 2026. HEROIC verified 3,532 records in the file, each containing an email address, a plaintext password, and the URL of the site the credential was tied to. The word Valid in the file name is a claim criminals make when they believe the credentials still work, and the underlying data traces back to stealer malware that pulled these logins directly from infected devices.

Why This Is Dangerous

Files marketed as valid combo lists are attractive to criminals precisely because someone has already done the work of confirming the credentials function. That means the 3,532 email and password pairs in this file are more likely to grant an attacker real access than credentials pulled from a random, unverified source. No cracking or guessing is required, only testing each pair against its target site.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites tied to each credential

Why This Matters

A combo list built from confirmed working credentials is exactly the kind of file attackers use to run large-scale credential stuffing attacks, automatically testing each pair against banking sites, email providers, and social media platforms. If any of the 3,532 people in this leak reused a password, an attacker could gain access to several of their accounts using this one file alone. From there, account takeover, identity theft, and financial fraud can follow quickly.

How Combo Lists and Stealer Logs Work

A combo list is a compiled set of email and password pairs, often assembled from multiple stealer logs, which are themselves produced by malware that infects a device through a pirated download, fake update, or malicious attachment and then harvests saved passwords and autofill data. Criminals frequently merge several smaller logs into a single combo list, test the credentials, and label the working ones valid before selling or sharing the file on Telegram channels and dark web forums. This extra verification step is what makes a labeled valid combo list more dangerous than an unverified stealer log of the same size.

Check If You Are Affected

With 3,532 confirmed working credentials in this file, the risk to anyone included is immediate. HEROIC's free breach scanner checks your email address against a database of more than 400 billion leaked records, including combo lists and stealer logs like this one, and tells you right away if you have been exposed. Run a free scan today to check your status.