"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. Automation makes attempts trying stolen username-password combinations against many services easy and cheap.

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