15.1 Million Plaintext Passwords Leaked in the StarX_ULP Combolist

In December 2025, HEROIC analysts identified a combolist file circulating on Telegram, uploaded under the label StarX_ULP_23.12.2025_Part_2. The file contained 15,162,704 records pairing email addresses, plaintext passwords, and associated URLs, information collected from previous breaches and compiled for resale and reuse by cybercriminals. Why this is dangerous: because the passwords in this file are stored in plaintext, anyone who downloads it can immediately use the email and password pairs to log into other accounts without needing to crack or decrypt anything. The included URLs often point to the specific sites or services each credential pair belongs to, giving an attacker a ready-made map for breaking into accounts tied to your email address. What was exposed: email addresses, plaintext passwords, and associated URLs or login links. Why this matters: combolists like this one are a favorite tool for credential stuffing attacks, where automated scripts test stolen email and password combinations against banking sites, email providers, and social media platforms. Anyone who reuses passwords across accounts faces a real risk of account takeover, identity theft, or financial fraud. How combolists work: a combolist is a compiled text file that combines login credentials, usually email addresses or usernames paired with passwords, gathered from multiple older breaches or malware infections. Criminals build and trade these lists on Telegram channels and dark web forums because they save attackers the work of hunting down credentials one breach at a time. Once a combolist is public, it can be used and reused by anyone who finds it, long after the original data was first stolen. Check if you are affected: with over 400 billion records in its database, HEROIC's free breach scanner can tell you in seconds whether your email address appears in this leak or any other breach on record. If it does, HEROIC will show you exactly what data was exposed so you can change passwords and secure your accounts before someone else uses them against you.