Unlocking Zero Trust: Entra ID’s Adaptive Access Revolution

When ransomware hits your cloud tenant, the root cause is rarely a brute-force password attack — it’s usually a gap in identity context, a loophole in conditional access, or a legacy authentication protocol left enabled “just in case.” The last six months have seen Microsoft overhaul Entra ID’s Zero Trust capabilities, bringing truly adaptive access to the fore. But what does this mean for practitioners?

WHAT’S NEW RIGHT NOW: Entra ID’s Adaptive Access Controls

The most significant shift in Entra ID is the rollout of Authentication Strengths and Conditional Access Policy Templates. No longer does “MFA required” mean a one-size-fits-all second factor. With Authentication Strengths (GA as of May 2024), you can now mandate granular combinations:

Example: Only allow access to sensitive SharePoint sites if users authenticate via phishing-resistant methods (FIDO2, Certificate-based Auth, or Microsoft Authenticator number matching), not SMS or voice calls.

This is enforced via the Policy portal at https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessMenuBlade/~/Policies — look for the new “Authentication Strength” dropdown under Grant Controls.

Additionally, Conditional Access Policy Templates (released April 2024) let you deploy Microsoft-recommended Zero Trust policies with a single click, including baseline protections for privileged accounts, device compliance, and legacy auth blocking.

For developers: the Microsoft Graph API now exposes Authentication Strengths under the /identity/conditionalAccess/authenticationStrengths endpoint, allowing automation and CI/CD integration. See the docs for schema and usage.

WHAT’S COMING: Roadmap & Preview Features

Looking ahead, Microsoft has signaled three major enhancements:

• Granular Session Controls: Public preview in Q3 2024 will allow real-time session re-evaluation (Continuous Access Evaluation, or CAE) based on device and location changes. Users will be forced to re-authenticate if risk spikes mid-session.
• Policy Analytics: Announced for late 2024, this feature will visualize the impact of conditional access policies — showing which apps and users are affected, where gaps exist, and how to optimize enforcement.
• PIM Integration with Authentication Strength: Privileged Identity Management (PIM) will soon require specific authentication strengths for elevation, closing loopholes where SMS MFA could be used to activate high-risk roles.

IT teams should watch the Microsoft Security Blog for preview announcements, and consider test deployments using the Preview blade in Entra Portal for new session controls.

WHY THIS APPROACH IS BETTER: Beyond Legacy MFA and Static Policies

Legacy MFA approaches treated all second factors equally, ignoring advances in phishing-resistant authentication and contextual risk. With Entra ID’s Authentication Strengths, you can:

• Block SMS/voice MFA universally, reducing SIM swap risk.
• Require device-bound authentication (e.g., FIDO2 keys or number matching) for sensitive actions.
• Apply different strengths per resource — e.g., stronger MFA for finance apps, device compliance for HR portals.

Conditional Access Policy Templates simplify the adoption curve. Instead of manually crafting dozens of policies, admins can deploy Microsoft’s vetted Zero Trust baseline and tune as needed. This reduces misconfiguration risk — a top cause of identity breaches, according to the 2024 Microsoft Digital Defense Report.

Continuous Access Evaluation (CAE) is a game-changer. Session enforcement means users can’t “camp out” after passing initial authentication; if their device becomes non-compliant or they move to a risky location, policy is re-applied instantly. This closes gaps exploited in recent real-world incidents, such as the 2024 Azure AD token theft wave.

Zero Trust in Practice: Implementation Guide

Step 1: Audit and Disable Legacy Authentication

Legacy protocols (e.g., Basic Auth, POP/IMAP) are a frequent attack vector. Use PowerShell to audit:

Get-MgUser | foreach { Get-MgUserAuthenticationMethod -UserId $_.Id }

In the Entra Portal, navigate to Security > Authentication Methods and disable legacy options. For Exchange Online, block Basic Auth via:

Set-AuthenticationPolicy -Identity "BlockBasicAuth" -AllowBasicAuthPopImap $false

Step 2: Deploy Policy Templates

Go to https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessMenuBlade/~/PolicyTemplates and select “Zero Trust Baseline.” Review and customize:

• Require MFA for all users
• Block legacy auth for sensitive apps
• Enforce device compliance

Test in Report-only mode before full deployment.

Step 3: Configure Authentication Strengths

Create new Authentication Strengths at Security > Authentication Methods > Authentication Strengths. Example:

{
  "name": "Phishing-Resistant",
  "allowedMethods": ["FIDO2", "Certificate", "AuthenticatorAppNumberMatching"]
}

Assign these in Conditional Access policies targeting privileged roles or critical apps.

Step 4: Monitor and Iterate

Use the Graph API (/identity/conditionalAccess/policies) to query enforcement and gaps:

GET https://graph.microsoft.com/v1.0/identity/conditionalAccess/policies

Review Sign-in logs for authentication failures and adjust policies as user friction or gaps are discovered.

Real-World Case Study: Financial Sector Hardening

In the wake of the 2023 “Golden SAML” exploit, a regional bank deployed Entra ID’s new adaptive access controls. By requiring phishing-resistant MFA for finance apps and applying session controls, they reduced credential phishing incidents by 82%. Key lessons:

• Phishing-resistant MFA (FIDO2, number matching) stopped attacker lateral movement.
• Continuous evaluation detected token replay attempts in real time.
• Policy templates cut deployment time by 60% vs. manual builds.

However, they encountered issues with legacy app compatibility — some older finance systems required exceptions. Workarounds included using App Passwords (not recommended) and eventually migrating app auth to modern protocols.

Edge Cases and Gotchas

Licensing: Authentication Strengths and advanced Conditional Access require Entra ID P1 or P2. Baseline policies are available with P1, but session controls and PIM integration need P2.

Device Compliance: CA policies relying on device compliance require devices to be enrolled in Intune or Hybrid Azure AD. BYOD scenarios may need custom risk policies.

Graph API Limitations: As of June 2024, not all policy analytics are exposed via Graph; manual log analysis is still required for deep impact reviews.

Legacy App Compatibility: Blocking legacy auth can break older apps. Inventory and test before enforcing strict policies.

Future-Proofing Your Identity Strategy

Zero Trust is not a static project — it’s an evolving set of controls that must keep pace with attacker innovation. Entra ID’s adaptive access model, backed by granular authentication strengths and session enforcement, positions enterprises to defend against modern threats. But the transition requires careful planning, phased rollout, and ongoing monitoring.

Practitioners should prioritize disabling legacy auth, deploying policy templates, and tightening authentication strengths. Stay alert for roadmap updates: session controls and policy analytics will make enforcement more dynamic and visible. Test new features in pilot groups and use the Graph API for automation.

Zero Trust done right is invisible to the attacker and seamless for the user — and Entra ID’s latest advances move us closer to that reality. Start your upgrade now, and ensure your access strategy survives the next wave of threats.