Integration testing and social engineering share a dangerous intersection. One verifies if systems talk to each other as intended. The other exploits how humans interact with those same systems. When you test integrations without thinking about social vectors, you risk validating functionality while leaving people exposed.
Integration testing focuses on workflows between modules, APIs, and services. It confirms that authentication flows, data transfers, and access controls behave under realistic conditions. But attackers know that bypassing technical barriers often requires manipulating the user, not the system. They exploit trust, misdirection, and incomplete training, pushing requests through legitimate integration points.
Social engineering vectors can be embedded in integration scenarios. An attacker might trigger API calls with credentials harvested through phishing. They could manipulate legitimate service hooks to execute unauthorized actions. Testing integrations without simulating these human-initiated events means missing a full class of vulnerabilities.