Platform security breaks when the weakest link fails. Sub-processors—third-party vendors that handle parts of your system’s operations—are often that link. They process data, run infrastructure, or provide specialized services. They also expand your attack surface. Every integration is a dependency. Every dependency is a risk.
A platform security framework that ignores sub-processors isn’t complete. Security audits must go beyond your own codebase. They must include all external services linked to sensitive data flows. This means tracking the sub-processor list, verifying compliance, testing incident response, and demanding transparency on breach notifications.
Risk assessment should be continuous. Sub-processors change, update, and sometimes bring on their own vendors—creating a chain of exposure. Require contractual controls, encryption standards, and proof of regular penetration testing. Establish clear termination procedures for compromised vendors. Map data paths to know exactly what each sub-processor touches, stores, or transmits.