The 400 Mail Access Leak Quietly Exposed 379 Email Logins

HEROIC analysts identified a stealer log dataset labeled "400 mail access," uploaded to a Telegram channel on July 8, 2025. Despite the round number in its name, the file actually contains 379 records made up of email addresses, plaintext passwords, and the URLs of the sites those credentials were used on.

Why This Is Dangerous

The phrase "mail access" signals exactly what this file is for: getting into email accounts, not just any website login. Whoever holds this data can sign into 379 inboxes right now, read private messages, and use those accounts to reset passwords on banking, shopping, or social media sites, expanding a single leaked login into control over someone's broader online identity.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs of the sites the credentials were used on

Why This Matters

Because these are plaintext credentials tied specifically to email logins, the immediate risk is direct inbox takeover. From there, attackers can pivot into other services through password reset links, and if any of these 379 people reused the same password elsewhere, credential stuffing attacks put even more of their accounts at risk.

How Stealer Logs Work

Stealer logs are produced by infostealer malware that infects a device through phishing emails, cracked software, or fake downloads, then silently harvests saved browser passwords, autofill data, and active sessions. Sellers often filter these logs down to specific categories, like "mail access" in this case, to advertise a more targeted and valuable product to buyers browsing Telegram channels.

Check If You Are Affected

Email access is one of the most sensitive things you can lose control of, so it pays to check. HEROIC's free breach scanner searches a database of more than 400 billion exposed records to give you an instant, clear answer and next steps if your information is found.