Credential stuffing is a cyberattack where criminals use stolen usernames and passwords to break into accounts. It sounds simple because, honestly, it is. The hard part is that one reused password can open a door somewhere else, especially when the same login has been used across several services.
Why Credential Stuffing Isn’t Automatically Excluded
A cyber insurance policy usually responds to certain losses caused by a security incident. Credential stuffing can fall into that area when attackers successfully access systems or accounts using stolen credentials.
But insurers don’t treat every credential stuffing incident in exactly the same way. A policy might cover an incident involving unauthorized access while another policy has wording that limits coverage for losses connected to stolen credentials. The difference is buried in the policy language. And that’s where things get interesting.
Look Closely at the Exclusions
Don’t stop after finding the word “cyberattack” in your policy. Read the exclusions too.
• Stolen credentials may have their own wording, which matters more than the broad promise of cyber coverage.
• Failure to follow security requirements can become a problem if the policy required stronger controls and they weren’t actually in use.
• Employee actions, though, are sometimes treated differently from attacks carried out by an outside criminal.
• Social engineering coverage is another wrinkle because a credential stuffing attack isn’t necessarily the same thing as an employee being tricked into sending money.
Security Controls Can Affect the Claim
This is probably the part businesses underestimate. An insurer may look at whether reasonable security measures were operating before the attack. Multi-factor authentication is a big one. Password controls matter too.
If a company promised the insurer that MFA was enabled for important systems but had left it switched off, the claim can become much harder to defend. That’s not because credential stuffing itself is always excluded. It’s because the policyholder may have failed to meet a condition of the policy.
What Should You Check Before Filing?
Start with the exact policy wording. Not the brochure. Not the sales email. The actual policy.
• The incident definition is crucial because it tells you what the insurer considers a covered cyber event.
• Exclusions deserve a slow read, especially anything mentioning unauthorized access or compromised credentials.
• Your security warranties sit in the middle of this too. If MFA was required, make sure you can show it was active.
Keep records of what happened and when. Login alerts, investigation notes, security logs, and communications with your insurer can all become relevant later.
And report the incident according to the policy’s notice requirements. Waiting because you’re unsure whether the event is covered isn’t a great strategy.
So, Is Credential Stuffing Excluded?
Usually, you can’t answer that with a simple yes or no. Credential stuffing isn’t inherently excluded from every cyber insurance policy. Some policies can cover losses arising from unauthorized access caused by compromised credentials, while specific exclusions or security conditions can restrict payment.