What is a CASB (Cloud Access Security Broker)?

A cloud access security broker (CASB) is a security solution that sits between users and cloud services to enforce an organization’s security, compliance, and access policies. It provides visibility into cloud application usage while helping protect sensitive data, control user access, and detect risky activity across Software-as-a-Service (SaaS), Platform-as-a-Service (PaaS), and Infrastructure-as-a-Service (IaaS) environments.

CASBs help organizations apply consistent security policies regardless of where users connect from or which cloud applications they access.

How does a cloud access security broker work?

A CASB acts as a policy enforcement point between users and cloud resources. Depending on the deployment model, it can inspect traffic, evaluate user and device context, and apply security controls before granting or restricting access.

Common capabilities include:

• Discovering sanctioned and unsanctioned cloud applications.
• Enforcing access and security policies.
• Protecting sensitive data through data security controls.
• Monitoring user activity across cloud services.
• Supporting compliance and auditing requirements.

These capabilities help organizations gain greater visibility and control over cloud usage while reducing security risks.

CASB vs. Secure Web Gateway (SWG)

Many organizations deploy CASB and SWG together as complementary components of a broader security architecture.

Why is a CASB important?

As cloud adoption grows, organizations often struggle to maintain visibility over user access, sensitive data, and the use of unsanctioned cloud applications. A CASB helps address these challenges by centralizing policy enforcement across cloud environments.

However, a CASB is only one part of a layered security strategy. Organizations typically combine it with identity management, endpoint security, and device compliance controls to strengthen overall protection.

How Hexnode complements a CASB strategy

Hexnode complements a CASB by strengthening endpoint security and identity-driven access decisions.

Hexnode UEM enables administrators to manage devices, enforce security policies, deploy applications, and monitor device compliance across supported platforms. When integrated with Microsoft Entra ID, Hexnode IDP supports authentication, role-based access control (RBAC), multi-factor authentication (MFA), and device compliance checks before users access organizational resources.

Together, these capabilities help organizations build a layered security approach that considers both user identity and device posture.

Best practices for cloud access security

Organizations can maximize the value of a CASB by following these best practices:

• Classify sensitive data before applying cloud security policies.
• Require multi-factor authentication for cloud applications.
• Enforce least-privilege access for users and administrators.
• Continuously review cloud application usage.
• Ensure devices accessing cloud resources meet compliance requirements.
• Regularly audit access policies and user activity.