Somewhere in your vendor list, right now, there is a door you have never checked. You didn’t build it, you don’t hold the key, and yet if someone walks through it, the breach notification goes out on your letterhead. The numbers too aren’t subtle. Verizon’s 2026 Data Breach Investigations Report found that 48% of breaches now involve a third party, up from 30% just a year earlier, the sharpest rise the report has ever recorded. Your vendors are your attack surface now.