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12/06/2026 1:09 am
TL;DR: Microsoft 365 environments are often weakened by permissive sharing, weak MFA, malicious app registrations, and hybrid sync risks, according to Zluri, with password reuse and admin overreach compounding exposure. The governance lesson is that M365 security fails when identity, privilege, and SaaS configuration are managed as separate problems.
NHIMG editorial — based on content published by Zluri: Security and compliance measures to strengthen your Microsoft 365 environment
Questions worth separating out
Q: How should security teams harden Microsoft 365 access without breaking collaboration?
A: Start by hardening the access paths that create the most reach, not by adding more layers everywhere.
Q: Why do Microsoft 365 environments become high-risk when admin roles are too broad?
A: Because admin roles compress the distance between compromise and impact.
Q: What breaks when Microsoft 365 hybrid directory synchronisation is insecure?
A: The boundary between on-premises identity control and cloud access becomes unreliable.
Practitioner guidance
- Harden Microsoft 365 sharing defaults Review file-sharing, meeting access, and guest collaboration settings against business intent, then remove permissive defaults that exceed the minimum required access.
- Enforce MFA coverage and test configuration quality Verify that MFA is enabled for all users and administrators, and check whether conditional access rules still leave high-value accounts exposed.
- Reduce standing admin privilege Map every admin role, eliminate unnecessary custom permissions, and require role assignments to be justified, time-bounded, and reviewed on a recurring basis.
What's in the full article
Zluri's full article covers the operational detail this post intentionally leaves for the source:
- Specific guidance on password manager use and password composition across Microsoft 365 users
- Step-by-step examples of MFA, SSO, and identity provider configuration inside the Zluri platform
- Risk scoring details for file sharing and admin access settings across Microsoft 365 apps
- Platform-specific visibility and automation capabilities for SaaS application discovery and control
👉 Read Zluri's analysis of Microsoft 365 security and identity control gaps →
Microsoft 365 security gaps and the identity controls teams miss?
Explore further
12/06/2026 10:52 am
Microsoft 365 security is an identity governance problem before it is a platform problem. The article’s risks all sit at the intersection of authentication, privilege, sharing, and directory trust. That means security teams should stop treating M365 as a standalone application and instead govern it as a high-density identity environment with many overlapping trust edges. The practitioner conclusion is that ownership must sit across IAM, SaaS governance, and privileged access controls.
A few things that frame the scale:
- 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, according to The State of Non-Human Identity Security.
- Only 1.5 out of 10 organisations are highly confident in their ability to secure NHIs, compared to nearly 1 in 4 for securing human identities.
A question worth separating out:
Q: Who is accountable when Microsoft 365 misconfiguration exposes sensitive data?
A: Accountability usually spans identity, collaboration, and infrastructure owners, because the failure often sits between teams rather than inside one control. Governance should define who owns authentication policy, sharing defaults, admin roles, and directory sync. Without that ownership map, misconfigurations linger because everyone assumes another team is responsible.
👉 Read our full editorial: Microsoft 365 security gaps expose identity controls to misconfiguration
