The yahoo.com Dump Contains Exactly 670,964 Login Pairs

HEROIC analysts identified a combolist file referencing yahoo.com accounts after it was uploaded to Telegram in August 2024. The file contains 670,964 records combining email addresses, plaintext passwords, and related URLs, one of the larger domain-specific credential lists we have logged. This is a combolist naming the yahoo.com domain, not a confirmed breach of Yahoo's own systems.

Why the yahoo.com Combolist Is Dangerous

Every one of these 670,964 records pairs a plaintext password with an email address, so attackers can skip cracking entirely and go straight to testing logins. Email accounts are also often the master key to other services, since a compromised inbox can be used to reset passwords on banking, shopping, and social media accounts.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated URLs

Why 670,964 Exposed Logins Is a Big Deal

A list this large gives attackers enough volume to run automated credential stuffing against many other websites at once. If your email and a reused password appear here, the risk extends well beyond your inbox, potentially reaching your banking, shopping, and social accounts too.

How a Domain-Specific Combolist Like This Is Compiled

Lists like this are usually built by filtering larger breach dumps and stealer logs down to accounts matching a specific email domain, in this case yahoo.com, then repackaging the results into a standalone file. This process does not require Yahoo's own systems to have been hacked directly, only that many yahoo.com users' credentials were harvested elsewhere, through phishing, malware, or older breaches, and then grouped together.

Check If Your yahoo.com Email Was Exposed

HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records. Run a scan now and change your password if you find a match.