Intune Security Best Practices: Avoid These 5 Configuration Mistakes

When Intune environments drift or ship without guardrails, attackers don’t need 0-days—they just walk through well-known gaps. Here are five misconfigurations I see repeatedly in enterprise tenants and how to remediate them with minimal friction.

1) Missing or weak Compliance Policies

• Symptom: Devices show as “Not evaluated” or “Compliant” with minimal checks.
• Risk: Conditional Access (CA) can’t enforce posture; unmanaged drift accumulates.
• Fix:
  • Create platform-specific compliance baselines (Win, iOS/iPadOS, Android, macOS).
  • Enforce OS version minimums, BitLocker/FileVault on, password complexity, AV on & up to date.
  • Tie to CA: Require “Compliant device” for risky apps (Exchange Online, SharePoint, Teams).

2) No (or overly permissive) App Protection Policies (MAM)

• Symptom: Corporate data can be opened in personal apps or exfiltrated to personal storage.
• Risk: BYOD and contractor devices leak data.
• Fix:
  • Create MAM policies for iOS/Android with managed open-in, paste controls, encrypted storage, conditional launch.
  • Enforce Require App PIN and Block Save As to personal storage.
  • Scope to all users - even if devices are enrolled, protect app layer.

3) Stale Devices from Missing Cleanup

• Symptom: Thousands of inactive devices linger; hard to see real exposure.
• Risk: False sense of compliance; orphaned devices grant residual access.
• Fix:
  • Use Device cleanup rules (auto-delete after 90–120 days of inactivity).
  • Create Intune device lifecycle SOP: enroll → monitor → retire/wipe → delete.

4) Overly Permissive Enrollment Settings

• Symptom: Any device can enroll; personal Windows devices creep into corp estate.
• Risk: Unknown ownership and data leakage.
• Fix:
  • Restrict enrollment by platform and user group.
  • Enforce corporate device identifiers (iOS, Android) and Windows Autopilot for join.
  • Require Device Categories for ownership tagging and policy scoping.

5) No Conditional Access Integration

• Symptom: Intune configured, but CA allows access from anything, anywhere.
• Risk: Identity-driven attacks succeed without device posture checks.
• Fix:
  • Baselines: MFA for all, Block legacy auth, Require compliant or hybrid-joined for key apps.
  • Add Sign-in risk and Location conditions as maturity grows.

My Take: Operationalize

• Monitor Secure Score (endpoint & identity), Intune Reports, Defender exposure score.
• Version your policy changes, and stage via pilot → expand → enforce.