Zscaler CASB

Zscaler CASB is a cloud access security broker delivered as a native component of the Zscaler Zero Trust Exchange, engineered to secure SaaS applications, identify shadow IT, and protect enterprise data across public cloud platforms. Providing both inline proxy inspection and out-of-band API protection, the platform gives organizations complete visibility and control over user interactions, sensitive data uploads, and configuration postures across thousands of enterprise and consumer cloud applications.

The service deploys across global hybrid workforces, utilizing lightweight client software or agentless reverse-proxy deployments alongside native cloud API connectors for platforms such as Microsoft 365, Google Workspace, Salesforce, Box, and AWS. It integrates seamlessly with enterprise identity providers, data loss prevention frameworks, and SIEM monitoring solutions to correlate cloud activities with broader enterprise security telemetry. Key organizational use cases include discovering and controlling unsanctioned shadow IT apps, preventing sensitive corporate data exfiltration to personal cloud storage, securing unmanaged third-party collaborator access, and auditing SaaS security configurations.

By unifying inline threat inspection with out-of-band API data classification and automated posture management, Zscaler CASB eliminates visibility blind spots across enterprise SaaS ecosystems. Security administrators benefit from unified policy creation, granular collaboration controls, and automated quarantine workflows that stop unauthorized data sharing in its tracks. The platform simplifies cloud security governance, ensures regulatory compliance with standards like HIPAA and GDPR, and enables safe cloud adoption across the modern enterprise.