Stolen and leaked credentials are behind a large share of business breaches. The challenge is that most companies have no idea their logins are circulating on the dark web until an attacker uses them. Here is how to tell whether your company’s credentials have been leaked, and what to do about it.
Where leaked company credentials come from
Corporate credentials reach criminals through several routes:
- Third-party breaches where employees reused a work password on a service that was hacked.
- Infostealer malware that harvests saved passwords and session cookies from infected devices, packaged into stealer logs.
- Phishing that captures logins and resells them to initial access brokers.
- Combolists that bundle email and password pairs for credential-stuffing attacks.
Signs your credentials may already be exposed
Watch for unexpected login alerts, password-reset emails nobody requested, MFA prompts users did not trigger, and spikes in failed logins. These can indicate that valid credentials are being tested against your systems.
How to check properly
Manual checks are not enough at company scale. Continuous dark web monitoring for business scans underground sources for your domains and alerts you when credentials appear. For workforce-specific coverage, employee credential monitoring detects leaked staff logins and stealer-log infections so you can force resets before attackers log in.
What to do if credentials are leaked
- Force a password reset for the affected accounts immediately.
- Revoke active sessions and tokens to defeat session-cookie theft.
- Enforce multi-factor authentication everywhere.
- Check for reuse of the same password across other systems.
- Feed the exposure into your SIEM and SOAR to automate response.
Get ahead of it
The fastest way to know where you stand is to scan now. Run a free dark web check of your domain, or book a demo to see continuous monitoring in action.
