Midmarket SaaS data outside M365: what security teams miss

TL;DR: HYCU argues that Microsoft Purview covers Microsoft 365 data well enough, but most midmarket sensitive data now sits across 50 to 200 SaaS apps where Purview has no visibility, and enterprise DSPM is priced and operated for larger teams. That leaves offboarding gaps, broad sharing, and shadow data stores as an unmanaged security problem.

Editorial analysis by NHI Mgmt Group, based on content published by HYCU: “Purview Ends at M365. Your Data Doesn't.”.

By the numbers:

• A typical 500-to-3,000-person company runs somewhere between 50 and 200 SaaS applications.

Key questions

Q: What breaks when Microsoft 365 data controls do not extend across SaaS apps?

A: The control boundary breaks at the application edge.

Q: Why do broad SaaS collaboration defaults increase data exposure risk?

A: They turn convenience into persistence.

Q: How can teams tell whether SaaS governance is actually working?

A: Look for evidence that discovered applications can be assigned an owner, tied to an access policy, and removed through an enforced workflow.

Practitioner guidance

• Map the non-Microsoft SaaS estate Inventory the applications where sensitive data actually resides, including collaboration tools, departmental platforms, and acquired-team systems.
• Tie offboarding to every SaaS application Extend deprovisioning beyond the identity provider so contractor, employee, and partner access is removed from each app that stores sensitive data.
• Review collaboration defaults for data-sharing risk Audit link-sharing, guest access, external collaboration, and export settings in the highest-risk SaaS apps.

Bottom line: Purview can control Microsoft 365 content, but it does not create visibility across the broader SaaS estate where midmarket sensitive data now lives.

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