Your Password May Be Exposed: Mix 15.09 Hit 142,391 Accounts

HEROIC analysts found a combolist called Mix 15.09 that a Telegram user uploaded, containing 142,391 records dated back to February 24, 2023. Each record pairs an email address with a plaintext password and the URL the login was intended for, giving anyone who obtains the file a large, ready-to-use set of working credentials. Why This Is Dangerous: With plaintext passwords, there is no cracking required. An attacker can automate login attempts across all 142,391 records in minutes using widely available credential-stuffing tools. If even a small percentage of these people reused their password elsewhere, that translates into thousands of accounts an attacker could break into today. What Was Exposed: Email addresses, plaintext passwords, and the destination URLs tied to each login. This combination tells an attacker exactly which site to target with which credential. Why This Matters: A leak of this size is large enough to fuel serious credential-stuffing campaigns. Attackers run these lists against banking portals, email providers, and shopping sites, hoping that password reuse gets them in. The result can be account takeover, drained financial accounts, and identity theft for anyone whose habits made them an easy target. How This Combolist Was Built: Files like Mix 15.09 are compiled from a mix of older breaches, phishing campaigns, and malware-infected devices, then bundled together and distributed on Telegram channels dedicated to sharing stolen data. The name Mix 15.09 reflects this: it is a mixed batch, not a breach of a single named company. Check If You Are Affected: HEROIC's free breach scanner checks your email against more than 400 billion exposed records, including combolists like Mix 15.09. Run a free scan today to see if your credentials are part of this leak and update any passwords you've reused elsewhere.