27K Mix Combolist Leak Exposes 26,849 Stolen Login Records

27K Mix: What HEROIC Analysts Found

On 10-Jul-2026, HEROIC threat analysts identified a combolist file titled "27K Mix" shared by a Telegram user. Despite the name suggesting a round number, the file actually contained 26,849 records, each pairing an email address with a plaintext password and the URL of the account it unlocks. The "mix" label indicates the credentials were pulled from a variety of sources rather than a single target.

Why This Is Dangerous

Because this is a mixed combolist, the nearly 27,000 accounts inside likely span many different websites and services rather than one platform. An attacker can sort through the file by the included URLs and target whichever type of account interests them most, whether that is email, retail, or financial logins, and attempt to log in immediately using the plaintext passwords provided.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why This Matters

Mixed combolists like 27K Mix are especially useful for large-scale credential stuffing, since the variety of account types increases the odds that a given password will unlock something valuable. Anyone in this file who reused their password elsewhere faces a heightened risk of account takeover, and from there, identity theft or financial fraud becomes a real possibility for close to 27,000 people.

How Combolists Work

A combolist pairs stolen login identifiers with their passwords, and "mix" files specifically combine credentials from several different breaches, phishing campaigns, or malware infections into one collection. This makes them harder to trace back to a single source but more versatile for attackers, since a single download can yield working logins across many different types of websites.

Check If You Are Affected

Because this leak pulls from a mix of sources, it is worth checking your email even if you do not recognize a specific service tied to this breach. HEROIC's free breach scanner searches more than 400 billion leaked records, including combolists like 27K Mix, so you can find out in seconds whether your credentials were exposed and take action to secure your accounts.