"define credential stuffing"

Credential stuffing is a common type of cyber attack. This attack exploits the common practice of reusing the same username-password combination across multiple services. After username-password combinations are found through data breaches, threat actors try unlocking other services using these combinations. This process can be automated, making attempts trying many combinations against many services largely effortless.

Glossary
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Dog with heart-shaped nose in a screen, AKA the Majorcord logo.