This briefing explains how cybercriminals exploit vendors and service providers to infiltrate customer systems. It identifies two main types: business email compromise and software supply chain breaches. Real-world cases, such as the Target data breach and COVID-19 vaccine supply chain attacks, illustrate the scale of risks. Proofpoint research shows 98% of organizations faced supplier-related threats in a one-week study. Recommendations include layered defenses, supplier risk visibility, DMARC adoption, and employee training to combat fraud and maintain trust in complex supply chains.

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