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24/06/2026 8:55 pm
TL;DR: Microsoft 365 remains a major data exposure surface across enterprise environments, with collaboration, identity, and access patterns creating recurring risk points for CISOs and data leaders, according to Cyera’s 2025 analysis. The real issue is not platform scale alone, but whether governance can keep pace with how data moves through identity-connected services.
NHIMG editorial — based on content published by Cyera: Top 10 Data Security Risks on Microsoft 365 Environments
Questions worth separating out
Q: How should teams reduce Microsoft 365 data exposure without slowing collaboration?
A: Start by separating high-risk content from ordinary collaboration data.
Q: Why do Microsoft 365 environments create persistent access risk?
A: Because access often outlives the business reason for granting it.
Q: What do security teams get wrong about Microsoft 365 governance?
A: They often treat Microsoft 365 as a document platform instead of an identity-governed collaboration layer.
Practitioner guidance
- Inventory high-risk collaboration paths Identify which sites, mailboxes, Teams, and shared documents contain sensitive data, then document who can access, share, or export them across internal and external identities.
- Reconcile guest and delegated access Review guest accounts, broad groups, app permissions, and delegated access paths to remove authority that no longer matches business need or ownership.
- Tie data classification to entitlement review Use classification results to drive access recertification so sensitive content triggers shorter review cycles and stricter approval paths than ordinary collaboration data.
What's in the full report
Cyera's full research covers the operational detail this post intentionally leaves for the source:
- Risk prioritisation across Microsoft 365 data exposure scenarios that helps teams sequence remediation work.
- Platform-specific analysis of the most notable exposure patterns across enterprise environments.
- Additional research context that supports board reporting and internal risk discussions.
- The complete list of top 10 Microsoft 365 risks with Cyera's supporting analysis.
👉 Read Cyera's top 10 Microsoft 365 data security risks analysis →
Microsoft 365 data risks: what IAM and security teams miss?
Explore further
25/06/2026 5:48 am
Microsoft 365 risk is fundamentally a governance problem, not just a data-loss problem. The platform concentrates identity, content, and collaboration in one place, which means permission drift quickly becomes data exposure. That makes access discipline, classification, and lifecycle oversight inseparable from the data security programme. The practitioner conclusion is that Microsoft 365 needs identity-aware governance, not isolated content 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.
- A separate finding from the same research shows that only 1.5 out of 10 organisations are highly confident in their ability to secure NHIs.
A question worth separating out:
Q: How can organisations tell whether Microsoft 365 controls are actually working?
A: Look for declining numbers of stale guests, reduced broad-group memberships, faster removal of obsolete delegated access, and shorter exposure windows for sensitive repositories. If those measures do not improve over time, the programme may be producing reports without changing actual access conditions.
👉 Read our full editorial: Microsoft 365 data security risks expose governance blind spots
