Reusing Passwords? The 12k Valid Combo Firecloudsupport Leak Is a Warning

HEROIC analysts identified a combolist called 12k Valid Combo Firecloudsupport that was uploaded to a Telegram channel on August 4, 2025. The file contains 12,208 records combining email addresses or usernames with plaintext passwords and associated URLs. Why This Is Dangerous Because the passwords in this file are unencrypted, anyone who downloads it can start testing the credentials right away. The label 12k Valid Combo suggests these logins were checked and confirmed to work before the file was shared, which makes it more dangerous than an unverified list, since attackers know the credentials are likely still active. What Was Exposed Email addresses Plaintext passwords URLs tied to each account Why This Matters If you reuse the same password across multiple sites, a leak like this one is exactly how accounts get taken over. Attackers plug combolists into automated tools that try each email and password pair across dozens of other services in a process known as credential stuffing. With 12,208 records already labeled as valid, this file is a ready-made toolkit for that kind of attack. How Combolist Attacks Work A combolist bundles usernames or emails with matching passwords, usually pulled from previous breaches, phishing campaigns, or malware infections, then compiled and shared for free or resold. Because there is no encryption to break, files like 12k Valid Combo Firecloudsupport can be used within minutes of being posted to a Telegram channel or dark web forum. Check If You Are Affected If you reuse passwords across accounts, it is worth checking whether your information appears in this leak. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, so you can quickly find out if your credentials were exposed and change your passwords before someone else uses them.