How to check whether your company credentials have been exposed

To check whether your company credentials have been exposed, define your scope (corporate domains and employee identities), query breach datasets, stealer logs and combolists for matches, confirm whether each hit is still live, then revoke and rotate. Compromised credentials were the initial access vector in 22% of breaches in Verizon's 2025 DBIR, so this is a recurring check, not a one-time scan.

How do you check if your company's credentials have been exposed?

You run an ordered check: scope, search, validate, remediate, repeat. Skipping the scope step is the usual mistake, because compromised credentials drove 22% of breaches in the 2025 DBIR and a blind search returns noise no analyst can triage (Verizon 2025 DBIR). Treat the five steps below as a repeatable playbook, not a project.

• Scope: enumerate every domain you own, plus subsidiaries, and the identities that use them (employees, contractors, service accounts).
• Search: query breach datasets, stealer logs and combolists for those domains and identities.
• Validate: confirm whether each matched credential or session is still live before you raise an incident.
• Remediate: revoke active sessions first, then rotate the password and any dependent secrets.
• Monitor: repeat on a schedule, because new logs surface daily and yesterday's clean result expires.

What scope should the check cover?

Every corporate domain and every identity tied to it, including the ones you forgot you owned. Verizon found 46% of compromised systems carrying corporate logins were non-managed devices holding both personal and work credentials (Verizon 2025 DBIR). A scope limited to managed endpoints misses almost half the exposure by design.

Write the scope down before you search. A useful inventory names the primary domain, acquired or regional domains, shared mailbox and alias patterns, and the SSO or VPN endpoints an attacker would target with a valid login. The point is coverage: a leaked credential on an obscure subsidiary domain still opens a door into the same identity provider.

• Primary and secondary corporate domains, plus recent acquisitions and regional variants.
• Employee and contractor identities, including shared and service accounts.
• Executive and privileged accounts, which deserve their own priority queue.
• SSO, VPN and cloud-console logins, the credentials that convert a leak into access.

What sources hold exposed corporate credentials?

Four, and they're not equal. Public breach datasets are the oldest and most searchable; stealer logs are the freshest and most dangerous; combolists repackage both; and dark web markets sell access built on all three. SpyCloud's recaptured identity pool reached 53.3 billion distinct records in 2024 (SpyCloud 2025). A real check reads more than one of these.

• Breach datasets: dumps from past corporate breaches, often years old, indexed by services like Have I Been Pwned. Good for reused passwords, weak for fresh exposure.
• Stealer logs: full snapshots of infected devices, carrying saved passwords, cookies and tokens with exact login URLs. The freshest corporate access lives here.
• Combolists: aggregated email-and-password pairs recompiled from many sources, used to fuel credential stuffing.
• Dark web and Telegram markets: where logs and access get listed, sold and traded, often within hours of infection.

Free vs commercial credential checks: what are the limits?

Free tools answer whether an address appeared in a known breach; commercial tools answer whether a live corporate session is exposed right now. Have I Been Pwned indexes more than 17.6 billion pwned accounts across 1,018 breaches, and it is genuinely useful (Have I Been Pwned). What it does not hold is stealer-log data, where the freshest corporate credentials and cookies land.

The gap matters because the dangerous exposure is the recent one. SpyCloud recaptured 3.1 billion plaintext passwords in 2024, a 125% jump, most of it from malware rather than old breach dumps (SpyCloud 2025). Free breach lookups will not show you a cookie captured from a contractor's laptop last week.

• Free breach lookups (HIBP, browser password checkers): fast, no cost, good for reused-password hygiene. Limited to known breach dumps, no stealer-log or cookie data, no domain-wide view.
• Commercial exposure platforms (SpyCloud, Flashpoint, Recorded Future and peers): cover stealer logs, combolists and dark web sources, offer domain-scoped queries and API automation. They cost money and vary in freshness and validation depth.
• In-house dark web monitoring: possible but expensive to staff and easy to do badly. Most teams get better coverage buying access to a maintained collection.

How do you confirm an exposed credential is still live?

You validate before you escalate, because a match in a five-year-old dump is not the same as an active session. The credential that matters most is the one attackers can replay without a password: the session cookie. SpyCloud recaptured 17.3 billion stolen cookies from infected devices in 2024 (SpyCloud 2025), and a live one skips both the login form and the MFA prompt.

Validate without handing secrets around. Check the source date and the exact login URL in the log, cross-reference the identity against your directory, and inspect your own identity-provider logs for active sessions or logins from unexpected locations tied to that account. The goal is a yes-or-no on whether this exposure is exploitable today, recorded on the case.

• Check freshness: the log's capture date and whether the password still matches your current policy state.
• Match the identity: confirm the account exists and map it to a real user or service in your directory.
• Look for live sessions: review IdP and SSO logs for active tokens or anomalous logins on that account.
• Record the finding: capture what was exposed, from which source, and whether it is still valid, on an auditable case.

What should you do the moment you find a live one?

Revoke the session first, then rotate the password. This order matters because a reset alone leaves the stolen cookie valid until it expires. Containment means killing active sessions, not just changing secrets (Recorded Future). Median attacker dwell time is 11 days, so every hour you shave off the response counts (Mandiant M-Trends 2025).

• Revoke all active sessions and refresh tokens for the affected identity, across SSO, email and cloud consoles.
• Rotate the password and any credential reused elsewhere, since reuse spreads one leak across several systems.
• Rotate dependent secrets a stealer log may expose: API keys, .env values and service-account tokens on developer machines.
• Re-image or clear the infected endpoint where you can identify it, so the log does not simply refill.
• Document the timeline for audit and, where applicable, regulatory notification.

The endpoint step is easy to skip and expensive to skip. If the infected device stays dirty, the next log carries the freshly rotated password too. Where the compromised machine is unmanaged, outside your EDR, you may only ever see the exposure from the outside, which is exactly why the check has to keep running.

Why does continuous checking beat a one-off scan?

Because exposure is a flow, not a snapshot. Flashpoint counted 11.1 million infostealer-infected devices in 2025, spilling over 3.3 billion credentials, cookies and tokens (Flashpoint 2025). A clean result today says nothing about the log that lists your VPN login tomorrow. Stolen credentials are now the second most common initial-access vector, at 16% (Mandiant M-Trends 2025).

Continuous, domain-scoped checking is the operational form of this playbook, and it is what Ashetrace is built around. You verify a domain you control, and the assessment surfaces exposed identities from breach and stealer-log sources with no passwords, cookies or tokens ever handed over. The output is the same yes-or-no an analyst needs to revoke and rotate on the record.

The economics back the habit. A breach still costs 4.44 million dollars on average and takes a mean 241 days to identify and contain (IBM 2025). Finding the exposed credential before the login attempt is one of the cheapest ways to compress that window, and it only works if the check never stops.