Cloud access security broker

A network/proxy-based security tool that sits between users and cloud applications, providing shadow SaaS discovery, access control, DLP for cloud apps, and compliance monitoring. CASBs operate at the network layer — inspecting traffic metadata, URLs, and (with TLS inspection) payload content.

CASBs are increasingly converged into SSE platforms alongside SWGs and ZTNA.

It depends on what you use it for. CASBs remain valuable for API-level cloud governance — auditing SaaS configurations, enforcing sharing policies, monitoring data via API connectors. For shadow SaaS discovery, phishing detection, and session-level security, browser-based tools like Push provide better coverage.

Push doesn't replace CASB's API-level governance, but it provides superior shadow SaaS discovery (login-event-based), phishing detection (behavioral), and session monitoring (marker injection).

Browser-session-level attacks: AiTM phishing pages, ClickFix clipboard hijacking, credential harvesting, session token theft via extensions, and OAuth consent abuse. Also login-level identity issues: weak passwords, MFA gaps, ghost logins, and shared accounts.

CASBs see where traffic goes; Push sees what the user actually does inside the browser session.

For threat detection, identity security, and browser-level SaaS discovery — yes. For API-level cloud governance (auditing SaaS configurations, enforcing sharing policies, content inspection via API connectors) — no.

Most organizations find Push and CASB complementary. Some use Push to replace the CASB capabilities they actually use while retaining CASB for API governance.

CASB operates at the network/proxy layer, seeing traffic metadata. Push operates inside the browser session, seeing rendered pages, credential entry, clipboard operations, OAuth consent events, and session behavior. Different observation layers, different detection capabilities.

CASB is better at traffic-level policy enforcement and API-level auditing. Push is better at behavioral phishing detection, credential hygiene, session hijacking detection, and extension security.

Not effectively. CASBs see network traffic patterns — URL destinations and traffic metadata. They can block known-malicious URLs but can't analyze rendered page behavior to detect phishing kits, cloned login pages, or AiTM reverse proxies.

Push detects phishing behaviorally at the page level. See Push's phishing detection.

No. CASBs don't operate inside the browser session. Credential entry on phishing pages, session cookie theft by extensions, and OAuth consent abuse are all invisible at the network layer.

Push detects credential theft and session hijacking at the browser layer — catching the attack at or before the point of compromise. See Push's session security.

CASB discovers SaaS from network traffic patterns. Push discovers SaaS from browser login events with full authentication context (method, password strength, MFA status). Push's discovery is more accurate and more actionable.

CASB misses apps accessed outside the corporate network. Push sees every login regardless of network path. See browser-based discovery.

CASBs require traffic routing through the proxy — challenging for remote users (VPN dependency) and BYOD users (traffic routing from personal devices). Users who bypass the VPN or access apps from personal devices are invisible.

Push deploys as a browser extension, operating inside the browser regardless of network path. No VPN, no proxy configuration required. See Push's BYOD capabilities.

For comprehensive cloud security, the two are complementary. CASB provides API-level governance — configuration auditing, sharing policies, API-level DLP. Push provides browser-level threat detection — behavioral phishing detection, session hijacking detection, credential hygiene, identity security.

CASB tells you how your cloud apps are configured. Push tells you what happens when users interact with them.