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Password Reuse
Security
Credential re-use across relying parties.
Definition
Password reuse is the practice of using identical or similar credentials across services, enabling breach-to-breach compromise via credential stuffing.
In plain English
Credential re-use across relying parties.
Why this matters
Why it matters: It turns a single password leak into multi-account exposure and raises account takeover risk.
Example
Example: A breached password from one site successfully authenticates to other services.