Search Your Email: The Kazakhstan Corp Mails Leak Exposed 1,044 Logins

In February 2026, HEROIC's threat intelligence analysts identified a combolist uploaded to Telegram by an anonymous user, tracked as "KAZAKHSTAN CORP-OTHERS-PRO MAILS TEST SAMPLE uploaded by a Telegram User." The file contains 1,044 records pairing corporate email addresses with plaintext passwords and the URLs of the login portals those credentials belong to.

Why This Is Dangerous

The "test sample" label is a common tactic sellers use to prove a larger corporate mailing list actually works before offering the full dataset for sale elsewhere. Even as a preview, this file hands out 1,044 working combinations of corporate email address and plaintext password, along with the exact login URL for each, giving an attacker everything needed to walk straight into a company's email system.

What Was Exposed

• Email addresses (corporate mail accounts)
• Plaintext passwords
• URLs linked to each credential pair

Why This Matters

Corporate email credentials are especially valuable to attackers because a single compromised inbox can be used to launch business email compromise scams, redirect invoices, or move laterally into other company systems. If any of the 1,044 accounts in this sample belong to you or your organization, reused passwords elsewhere could turn one exposed login into a much bigger breach across personal and business accounts alike.

How Combolist Leaks Work

A combolist packages email and password pairs, typically formatted as email:password, often with the matching login URL attached. Samples like this one are frequently posted on Telegram as a form of advertising, letting buyers verify the credentials are current before purchasing a larger set. That means a small sample can be the tip of a much larger corporate credential leak still circulating unseen.

Check If You Are Affected

If you or your business uses a corporate email account, it's worth checking now. HEROIC's free breach scanner searches more than 400 billion exposed records, including this leak, so you can see if your credentials are part of it and reset them before an attacker gets there first.