Glossary
What is data breach?
A data breach is an incident where sensitive, protected or confidential data is accessed, exposed or stolen without authorization. Breaches often expose credentials, personal information or financial data — which attackers then use or sell.
How data breaches happen
Many breaches start with a person: a phishing email that steals a password, a reused credential exposed in someone else's breach, or a misconfigured system. Once attackers have access, they move to exfiltrate data.
Stolen credentials are especially dangerous because people reuse passwords — one leak can unlock many accounts through credential stuffing.
The impact of a breach
Breaches cause financial loss, regulatory penalties, operational disruption and lasting damage to trust. The sooner you detect exposure, the more you can limit the damage.
How to prevent data breach
- Use multi-factor authentication everywhere to blunt stolen passwords.
- Train people to resist the phishing that causes many breaches.
- Monitor the dark web and breach data for your exposed credentials.
- Force resets quickly when an account is found to be exposed.
How HookPhish helps
HookPhish dark web and data breach monitoring alert you the moment your credentials appear in a breach, while training and simulation reduce the phishing that causes breaches in the first place.
Frequently asked questions
What should I do after a data breach?+
Change exposed passwords (and anywhere you reused them), enable MFA, watch for phishing that follows breaches, and monitor for further exposure.
How do I know if my data was breached?+
Use a data breach checker for a one-off look, and enable continuous monitoring to be alerted when your credentials appear in new breaches.
What is credential stuffing?+
Credential stuffing is when attackers take passwords leaked in one breach and try them across many sites, exploiting password reuse.
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