When cybercriminals compile their attack databases, they're hunting for a specific combination: your email address paired with your password—in readable, plaintext format. Our analysis of over 25.4 billion breach records reveals a troubling reality: this deadly combination appears more frequently than any other data type in the underground ecosystem.
The Plaintext Password Problem
Plaintext passwords have been exposed in 27,312 distinct security incidents tracked in our database. That's not hashed passwords that require cracking. Not encrypted passwords that demand computational resources. These are readable, copy-and-paste-ready credentials that attackers can immediately deploy.
The scale becomes clearer when you examine major combolist breaches. The XSS.IS Combolist alone contains 2.47 billion records, each pairing email addresses with plaintext passwords. The Misc Combolists collection adds another 1.92 billion credential pairs. The Ga$$Pacc Collection contributes 518 million more.
These aren't theoretical vulnerabilities. They're active exploitation databases circulating on cybercrime forums right now.
Why Email Addresses Make Everything Worse
Email addresses appear in 25,482 breaches—nearly matching the frequency of plaintext passwords. This isn't coincidental. Email addresses serve as the universal username across the internet, making them the perfect indexing key for credential databases.
Consider the Verifications.io breach: 722 million records containing email addresses, phone numbers, and personal names. While it didn't include passwords, attackers cross-reference this data with password-containing breaches to build comprehensive profiles.
The authentication ecosystem's reliance on email addresses creates a cascading vulnerability. One breached credential doesn't just compromise a single account—it potentially unlocks every service where you've reused that email-password combination.
URLs: The Overlooked Attack Vector
You might be surprised that URLs rank third among exposed data types, appearing in 25,482 breaches. These aren't random web addresses. They're the specific sites where you've registered accounts, the platforms where you've stored sensitive information, the services you trust with your data.
Stealer malware—responsible for 16,062 breaches in our database—specifically harvests browser history, saved passwords, and cookies tied to particular URLs. This gives attackers a roadmap of your online presence: your banking sites, shopping accounts, social media profiles, and work applications.
When combined with credentials, URL data enables targeted attacks. Criminals know exactly which services to attempt credential stuffing against for maximum payoff.
Personal Identifiers Complete the Picture
The presence of first names (1,421 breaches), last names (1,409 breaches), and phone numbers (1,021 breaches) transforms impersonal credentials into identity theft fuel.
Take the Weibo breach: 503 million phone numbers exposed. Cross-reference these with the 1,822 breaches containing plaintext passwords, and attackers can execute convincing phishing campaigns that reference your actual credentials alongside personal details.
IP addresses, appearing in 775 breaches, add another dimension. They reveal your geographic location, internet provider, and browsing patterns—valuable intelligence for spear-phishing attacks that reference your city or recent online activity.
Password Hashes: A False Sense of Security
While 2,482 breaches contain password hashes rather than plaintext, don't assume these are safe. Modern GPU-accelerated cracking tools can process billions of hash combinations per second. Weak passwords fall within minutes. Even moderate passwords become vulnerable given sufficient time and computing resources.
The MySpace breach from 2008 exemplifies this risk. Though passwords were initially hashed, security researchers later cracked the vast majority using rainbow tables and brute force techniques. Those 301 million accounts are now effectively compromised with plaintext credentials.
What This Means for You
The convergence of these data types creates perfect conditions for account takeover attacks:
- Credential stuffing: Automated tools test your leaked email-password combinations across thousands of websites
- Account enumeration: Attackers identify which services you use based on exposed URLs and registration data
- Targeted phishing: Personal details make fraudulent emails appear legitimate and urgent
- SIM swapping: Phone numbers enable mobile carrier fraud to intercept authentication codes
The 9,513 combolist breaches in our database exist specifically to streamline these attacks. They're pre-processed, cleaned, and organized for maximum criminal efficiency.
Protect Yourself Now
Given this landscape, three actions become non-negotiable:
Use unique passwords everywhere. Password managers generate and store complex, site-specific credentials that render combolists useless against your accounts.
Enable multi-factor authentication. Even if your password is compromised, attackers can't authenticate without your second factor.
Monitor your exposure. You can't protect credentials you don't know are leaked.
Check whether your email addresses, usernames, or phone numbers appear in our indexed 25.4 billion breach records. Search by email, username, or domain at LeakedSource to see exactly which breaches have exposed your information—and what data types were compromised.
Your credentials are already in criminal databases. The question is whether you'll discover this before attackers exploit them.