Credential Stuffing…A Side Effect of Data Breaches

This report describes credential stuffing: attackers leverage breached credentials (often bought on the dark web) and automated tools—botnets, proxy chains, and randomized login behavior—to perform large-scale login attempts. Although researchers estimate success rates under 2%, the large volume of leaked credentials makes even small success rates impactful; the report recommends monitoring clear and dark web sources for leaked credentials and adopting protective detection and mitigation measures.