10,059 Plaintext Login Pairs Surface in a Telegram Combolist

HEROIC logged a combolist uploaded to Telegram on 10 October 2023 that holds 10,059 email and password pairs, each stored in plaintext alongside the URL it was tied to. A file of this size sits comfortably between the small single site dumps and the million record lists analysts see weekly, big enough to matter but easy to overlook. See if your address is inside it with a free scan your email.

Why this is dangerous

Plaintext storage means the password is exactly what the login holder typed, with nothing to crack. Paired with the login URL for each entry, an attacker doesn't have to guess where a credential works; the file tells them.

What was exposed

• Email addresses, the anchor point for each credential pair.
• Plaintext passwords, usable the moment the file is opened.
• Login URLs, pointing directly at the service each pair unlocks.

Why this matters

A file this size is small enough for a single attacker to work through manually, testing each pair by hand against high value targets like email providers and banks, rather than relying only on automated tools. That makes the danger more personal and the timeline faster than people expect.

How this breach type works

A combolist like this one is pieced together from multiple smaller leaks and malware output rather than any single company's systems being entered. It becomes dangerous through credential stuffing, where attackers feed the list into automated tools that test each email and password pair against other popular login pages.

What should you do if your email is on this list?

Run a free scan your email to check your address against this file and every other exposure HEROIC has on record. A match means changing that password right away, on the exposed login and everywhere else you reused it. Treat a work email address with the same urgency as a personal one.