1,192 Japanese Inboxes Exposed in the 1300 .JP Mail Access Leak

In February 2026, a stealer log labeled "1300 .JP Mail Access" was uploaded to Telegram, exposing 1,192 records tied to Japanese email accounts. The file contains email addresses, plaintext passwords, and the URLs those accounts connect to, harvested from devices infected with information-stealing malware.

The ".JP" in the name refers to the domain suffix used by many Japanese email accounts, not a single mail provider that was hacked. This is a stealer-log credential harvest pulled from infected devices, not a breach of any one company's servers.

Why This Is Dangerous

Although 1,192 accounts is a small number compared to some breaches, every single one of those credentials is fully usable. The passwords were stored in plaintext, so there is no encryption to break through, and the matching URLs tell an attacker exactly which login page each password opens.

A smaller leak like this one is often more dangerous per victim, not less. Criminals working through a short, targeted list can spend real time and effort testing each account individually rather than relying purely on automation.

What Was Exposed

• Email addresses
• Plaintext passwords
• URLs tied to the affected mail accounts

Why This Matters

Even with 1,192 records, the exposed email and password pairs can be run through credential stuffing tools that try the same login across other services, banking portals, and shopping sites. Password reuse means one leaked email login can open the door to several unrelated accounts belonging to the same person.

From there, the usual chain of harm follows: account takeover of the email itself, which is often the key to resetting passwords on every other account tied to it, identity theft as personal details accumulate, and financial fraud if any payment or banking access is linked to the compromised inbox.

How Stealer Log Leaks Work

This kind of leak starts with malware quietly installed on a victim's device, often through a malicious download or a fake installer. The malware copies saved browser passwords, autofill data, and login URLs, then sends that information back to whoever controls it. The stolen data is then bundled into a log and shared, as it was here, in a Telegram channel.

Because the credentials are pulled directly from the infected device rather than from a company's own systems, this kind of leak can happen no matter how secure the email provider itself is.

Check If You Are Affected

Even a leak of 1,192 records is enough to put real people at risk if their information is among them. HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, including stealer logs like this one, so you can find out in seconds whether your account was exposed and secure it before someone else does.