The Mansory 16 Dump: 4.3 Million Stolen Login Credentials Surface

In December 2025, HEROIC analysts identified a large combolist file named Mansory 16 uploaded to a Telegram channel used for trading stolen credentials. Unlike most of the small files that circulate on these channels, this one contained 4,316,862 records, each pairing an email address with a plaintext password and the URL the login was captured from. Why This Is Dangerous: A file of this size means millions of working logins are sitting in plaintext, ready to use. Because there is no encryption to break, anyone who obtains the file can begin testing credentials against other services immediately and at scale, using automated software rather than manual effort. What Was Exposed: - Email addresses - Plaintext passwords - URLs linked to each login Why This Matters: At a scale of 4.3 million records, even a small percentage of password reuse translates into hundreds of thousands of accounts that could be taken over elsewhere. This kind of data fuels large, automated credential stuffing campaigns aimed at email providers, banks, and online retailers, and it is a common precursor to identity theft and financial fraud for the people whose information is included. How a Combolist Like This Works: Large combolists like Mansory 16 are typically stitched together from many smaller sources, older breaches, stealer malware logs, and previously leaked databases, then merged, deduplicated, and repackaged into a single file. The size and the generic name make it hard to trace back to one original source, but the risk to each person inside it is identical to being caught in a breach of a single large company. Check If You Are Affected: Search your email address in HEROIC's free breach scanner, which checks against more than 400 billion exposed records, including the Mansory 16 dataset. If you get a match, change that password immediately and everywhere else you have reused it.