2,964 Plaintext Passwords Dumped From jsumail.com Logs

HEROIC analysts identified a stealer log file uploaded by a Telegram user that exposed credentials linked to jsumail.com. The dataset, first observed on June 21, 2026, contains 2,964 records compromising email addresses, plaintext passwords, and associated URLs. The breach originated from infostealer malware targeting endpoints in the United States.

Why Plaintext Passwords Are an Immediate Threat

Unlike hashed or encrypted credentials, the passwords in this dump are stored in plaintext. That means attackers can use them instantly without any cracking tools or computational effort. The moment this file appeared on Telegram, every credential inside became a live weapon.

Threat actors routinely harvest plaintext credentials from stealer log drops like this one. Automated tools can ingest thousands of email-and-password pairs in seconds, launching login attempts across banking portals, email providers, and social media platforms before victims even know they have been exposed.

What Was Exposed in the jsumail.com Dump

• Email Addresses — Full email addresses tied to user accounts, enabling targeted phishing and account takeover attempts.
• Plaintext Passwords — Unencrypted passwords ready for immediate use in credential-stuffing attacks.
• URLs — Specific website addresses the victims visited, revealing which services and accounts are vulnerable.

Why 2,964 Stolen Credentials Can Cause Widespread Damage

Research consistently shows that over 60% of people reuse passwords across multiple services. A single plaintext credential from this dump could unlock not just one account but an entire chain of connected services — email, cloud storage, financial platforms, and more.

Credential-stuffing attacks powered by dumps like this one are among the most common vectors for account compromise today. Attackers pair the stolen emails and passwords with automated bots that test them across hundreds of websites simultaneously, often achieving hit rates between 1% and 3% — which in a dataset of nearly 3,000 records means dozens of additional accounts breached.

How Stealer Logs Harvest Your Credentials Silently

Infostealer malware operates in the background of infected devices, capturing every credential saved in browsers, auto-fill data, session cookies, and even cryptocurrency wallet keys. Victims typically have no idea their machine has been compromised until their accounts start showing unauthorized activity.

Once harvested, these credential packages — called stealer logs — are bundled and distributed through Telegram channels and dark web marketplaces. The jsumail.com dataset follows this exact pattern: malware silently captured login data from infected endpoints, and the resulting log was uploaded to Telegram where it became freely available to anyone monitoring those channels.

Check If Your Credentials Were Exposed

If you have ever used jsumail.com or any of the URLs found in this dataset, your login details may be in circulation. Use HEROIC's free breach scanner to search across more than 400 billion compromised records and find out whether your email or password appears in this or any other known breach. Taking action now — changing passwords and enabling multi-factor authentication — can prevent attackers from leveraging these stolen credentials against you.