Your Login May Be Exposed: MailPass UP_KURZL0G 1 Hit 195,908

Your login may already be sitting in a criminal's hands. HEROIC analysts confirmed a stealer log dump called MailPass UP_KURZL0G 1, uploaded to a Telegram channel on November 1, 2025, containing 195,908 records. Each entry pairs an email address with a plaintext password and the URL of the exact account it unlocks, giving whoever holds the file a direct, ready to use path into nearly 200,000 accounts.

Why the MailPass UP_KURZL0G 1 Leak Is Dangerous

There is no encryption standing between an attacker and these accounts. The passwords are stored in plaintext, meaning anyone who gets a copy of the file can immediately start logging in without cracking a single hash or running a single guess. For the 195,908 people inside this dump, their accounts are as accessible to a stranger right now as they are to the account owner themselves.

What Was Exposed in the MailPass UP_KURZL0G 1 Dump

• Email addresses tied to real accounts
• Plaintext passwords with no encryption whatsoever
• URLs pinpointing exactly which site or service each login opens

HEROIC confirmed 195,908 records total, most connected to users in the United States.

Why This Matters More Than You Might Think

A file of this size gives criminals plenty of material to run through credential stuffing tools, which quietly test each stolen email and password against dozens of other popular websites. Because so many people still resuse passwords across accounts, a single leaked login can lead to account takeover on a banking site, a shopping account, or an email inbox, opening the door to identity theft and financial fraud that can take months to fully unwind.

How a Stealer Log Like MailPass UP_KURZL0G 1 Comes to Exist

Stealer logs are built by infostealer malware, wich typically arrives disguised as a pirated download, a cracked application, or a malicious email attachment. Once installed, it silently reads every saved password and browsing URL out of the victim's browser and sends the collected data back to the attacker. From there, files get renamed, packaged, and posted to Telegram channels or dark web forums under labels like MailPass UP_KURZL0G 1, ready for sale or direct use.

Check If You Are Affected

If your data may already be compromised, the only way to know for sure is to check. HEROIC's free breach scanner searches a database of more than 400 billion leaked records, including dumps like MailPass UP_KURZL0G 1, and gives you an answer in seconds. Run a free scan now and change any password that comes back exposed before someone else uses it first.