Microsoft 49 Stealer Log Leak: Check If Your Password Was Exposed

In early May 2026, HEROIC analysts identified a small stealer log file labeled "Microsoft 49," uploaded to a Telegram channel by an unidentified user. The file exposed 48 records pairing email addresses with plaintext passwords and the URLs of the login pages they were captured from, likely including Microsoft account sign-in pages, gathered from a device infected with information-stealing malware.

Why Even a Small Leak Like Microsoft 49 Is Dangerous

Forty-eight records is a small file, but size doesn't determine risk for the people in it. This isn't a breach of Microsoft's own systems, it's a batch of stolen logins pulled from an infected device and labeled "Microsoft 49" after the sign-in pages involved. Each stolen password is paired with the exact URL it unlocks, so if your credentials are among the 48, an attacker already knows where to use them. Because the passwords were stored in plaintext, no cracking is needed to use them immediately.

What Was Exposed in the Microsoft 49 Leak

• 48 email addresses used as account logins
• Plaintext passwords tied to each email
• The URLs of the login pages, apparently including Microsoft account portals, each credential unlocked

Why a Small Leak Still Deserves a Check

If you're one of the 48 people in this file and you've reused that password on other accounts, criminals can use it for credential stuffing against your email, banking, or work logins. A small stealer log like this one is often just one of many circulating on the same channels, so checking your exposure isn't about this single leak, it's about knowing your overall risk.

How a Small Stealer Log Like This Gets Made

Stealer logs come from malware that infects a device, often through a malicious download, cracked software, or phishing link, then quietly copies usernames, passwords, and saved URLs from the browser. The stolen data is bundled into a file and sent back to whoever controls the infection. Small files like this one are often uploaded to Telegram channels in batches, alongside many other logs, which is exactly where HEROIC analysts found it.

Check If Your Password Is One of the 48 Exposed

HEROIC's free breach scanner checks your email address against more than 400 billion leaked records, including small stealer logs like this one. If your credentials appear in the Microsoft 49 leak or any other breach, you'll get clear steps to secure your accounts. Run a free scan now to find out.