Why organisations should adopt Entra Global Secure Access for Zero Trust networks (Part-1)

Legacy VPNs were built for a different era. They assumed a trusted corporate network perimeter, a small set of managed devices, and predictable working locations. In 2026, that model is a liability.

Microsoft Entra Global Secure Access shifts remote access from network location trust to identity trust. Instead of giving users broad network reach once they connect, it verifies every access request using identity signals, device health, and contextual risk. This is the practical path to a Zero Trust network when your workforce and applications are distributed. (learn.microsoft.com)

The VPN problem is not just performance; it is blast radius

Most security leaders can list the operational pain points of VPNs: split-tunnelling debates, fragile clients, hairpin routing, and a constant trade-off between usability and control.

The bigger issue is exposure. A VPN commonly grants network-level access that is far wider than the user actually needs. Once an attacker gains valid credentials or a token, the VPN becomes a pivot point for lateral movement, discovery, and data access that is hard to quickly constrain.

Zero Trust demands the opposite approach: least privilege, explicit verification, and an assume breach mindset. Entra Global Secure Access is designed around those principles. (learn.microsoft.com)

What Entra Global Secure Access actually is

Entra Global Secure Access is the umbrella for two services:

1. Microsoft Entra Internet Access is an identity-based secure web gateway for internet and SaaS traffic.
2. Microsoft Entra Private Access, a Zero Trust Network Access approach for private corporate resources, extends beyond classic application proxy patterns to more private resources, ports, and protocols. (learn.microsoft.com)

In plain terms, it helps you apply Conditional Access style controls to network flows, not only to sign-ins to a handful of federated applications.

Identity-based controls that verify every access request

A strong Zero Trust design starts with the question: what signals should decide access right now, not what was true at login time.

With Entra Global Secure Access, policy can incorporate rich context such as:

1. User identity and group membership
2. Device compliance and health posture
3. Location and sign-in risk
4. Session context and changes in risk over time (learn.microsoft.com)

This is the strategic difference from a VPN, which often authenticates once, then relies on network reachability. Global Secure Access ties enforcement to identity signals and adjusts when those signals change.

Granular per-app access instead of network-wide access

One of the most defensible security outcomes you can aim for is reducing implicit reachability.

Per-app access means a user can access the applications they are authorised to use without being placed on a broad private network segment. That reduces:

1. Lateral movement opportunities
2. Accidental access to legacy systems
3. The number of paths an attacker can probe after compromise

Microsoft positions Entra Private Access as a replacement for legacy VPNs, leveraging an identity-centric Security Service Edge approach. (microsoft.com)

Continuous monitoring that makes access revocation real

Most leaders know the uncomfortable truth about traditional sessions: if access is granted for an hour, it can remain usable for most of that hour even if risk changes.

Global Secure Access includes Universal Continuous Access Evaluation, which revalidates access when Entra ID detects key identity security events, such as account disablement, password reset, token revocation, or high user risk detection. In strict enforcement modes, access can be stopped immediately when conditions are not met. (learn.microsoft.com)

This matters operationally because incident response is often a race against time. Cutting the window between detection and enforcement reduces the chance that a compromised session is used for exfiltration.

Continuous enforcement is only valuable if your identity and device signals are trustworthy. If device compliance is weak or identity risk detection is not tuned, you will either block too little or disrupt too much.

Reducing breaches in distributed environments: what the evidence suggests

Security teams often ask for quantified outcomes, and it is right to be sceptical of simple numbers.

However, there is a consistent directional finding across Zero Trust research and case studies: narrowing access scope, continuously re evaluating risk, and enforcing identity bound controls reduces breach likelihood and impact. Some studies report reductions in security breaches up to around 50 percent when Zero Trust controls are combined with modern network architectures, especially in distributed environments where perimeter assumptions fail most often. (jisem-journal.com)

Treat these figures as indicative rather than guaranteed. Your actual result will depend on identity hygiene, device compliance coverage, and how much legacy reachability you remove.

Stronger protection for SaaS and internet access with Microsoft Defender for Cloud Apps

Zero Trust networks are not only about private apps. Your largest data flows usually involve SaaS platforms and general internet use.

Microsoft Defender for Cloud Apps supports a Zero Trust strategy by discovering SaaS usage, applying policies, and detecting anomalous behaviour such as impossible travel and unusual download or forwarding patterns. It can then inform Entra ID so that the next access request can be stepped up or blocked based on risk. (learn.microsoft.com)

When paired with Entra Internet Access, you gain a more complete picture:

1. Network level control for internet and SaaS traffic
2. Identity driven enforcement through Conditional Access integration
3. Behavioural detection and policy response through Defender for Cloud Apps (learn.microsoft.com)

This is how you move from static allow lists to adaptive control that responds to real user behaviour.

A practical adoption approach for CISOs and security managers

Most organisations should avoid a big bang VPN removal. A controlled migration reduces risk and user friction.

A pragmatic rollout plan looks like this:

1. Segment use cases
   Start with a clear map of who uses VPN, for what applications, and from which device types.
2. Establish identity and device prerequisites
   Ensure Conditional Access baselines are in place, device compliance is meaningful, and break-glass access is tested.
3. Pilot per-app access for a low-risk group
   Pick one or two internal applications that are well understood and have measurable usage.
4. Extend to broader private access
   Expand coverage by application group, not by network segment.
5. Add internet and SaaS controls
   Apply Entra Internet Access policies and integrate Defender for Cloud Apps for discovery and threat response.
6. Measure and iterate
   Track access blocks, user friction, incident volume, and time to revoke access during investigations.

Common pitfalls to avoid

A Zero Trust rollout fails when policy is treated as a technical exercise rather than an operating model.

Watch out for these patterns:

1. Over-permissive exceptions for executives and frequent travellers
2. Weak device compliance definitions that can be trivially met
3. Poor understanding of legacy dependencies, leading to rushed bypasses
4. Lack of operational playbooks for when access is challenged or revoked during an incident

The goal is not to block more. The goal is to make access decisions more accurate and to reduce the time attackers can operate after initial compromise.

Where this fits in a modern SOC operating model

Entra Global Secure Access changes the enforcement layer. Your SOC still needs to investigate alerts, validate risk, and respond quickly.

This is where security operations maturity becomes the differentiator: consistent triage, clear ownership, and automation that reduces toil without hiding risk. If you are also modernising Sentinel operations, it is worth considering how conversational investigation and guided workflows can reduce reliance on specialist query skills while maintaining tight governance.

For further reading on security operations modernisation, see SecQube.

Conclusion

Organisations adopt Entra Global Secure Access because it aligns network access with how Zero Trust should work in practice: verify explicitly, minimise implicit trust, and respond continuously as risk changes.

It replaces the broad reachability of VPNs with identity-based, per-app control and continuous monitoring. When integrated with Microsoft Defender for Cloud Apps, it also strengthens SaaS and internet protection with behavioural detection and adaptive response.

For CISOs, CTOs, and security managers, the most compelling outcome is not a new remote access product. It offers a smaller blast radius, faster enforcement during incidents, and a network access posture that aligns with the reality of distributed work.