Security Breach

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A Security Breach is any incident that results in unauthorized access to computer data, applications, networks, or devices. It results in information being accessed without authorization. Typically, it occurs when an intruder is able to bypass security mechanisms.

Technically, there's a distinction between a security breach and a data breach. A security breach is effectively a break-in, whereas a data breach is defined as the cybercriminal getting away with information. Imagine a burglar; the security breach is when he climbs through the window, and the data breach is when he grabs your pocketbook or laptop and takes it away.

Source: https://usa.kaspersky.com/resource-center/threats/what-is-a-security-breach