Microsoft 365 tenant-level attacks expose security blind spot as CoreView launches Tenant Resilience and Tenant Management

Washington DC, US, 20 January 2026 - CoreView, the global leader in Microsoft 365 tenant resilience, today announced the availability of Tenant Resilience delivered through the CoreView One platform, alongside a dedicated Tenant Management offering, as organisations confront growing risk at the Microsoft 365 tenant level.

With 63% of Microsoft 365 tenants failing to enforce least-privilege access, and Microsoft reporting a rise in configuration tampering across identity and device management services, enterprises are reassessing how they protect and recover the tenant itself. CoreView’s announcement targets two distinct groups responsible for Microsoft 365 tenants: security teams focused on tenant protection and recovery, and operational teams responsible for day-to-day governance and administration.

Delivered through the CoreView platform, Tenant Resilience and Tenant Management address configuration risk, excessive administrative privilege, and the operational strain organisations face when securing and recovering Microsoft 365 environments under pressure.

“Many organisations believe their Microsoft 365 environment is protected until a single configuration change or over-privileged account breaks that assumption,” said Andrea Sivieri, Chief Product Officer at CoreView. “Microsoft 365 has become critical infrastructure, yet configuration drift and unchecked access rights still undermine tenant security far more often than people realise. Taking deliberate control of configuration and privilege allows organisations to protect the tenant itself and operate Microsoft 365 safely at scale, even as complexity grows.”

CoreView Tenant Resilience

Tenant Resilience focuses on helping organisations prepare for, withstand, and recover from tenant-level incidents that traditional SaaS security tools are not designed to address. Built around a resilience-first approach to Microsoft 365, Tenant Resilience helps organisations:

• Reduce the impact of compromised privileged accounts by limiting excessive administrative access
• Detect unauthorised or high-risk configuration changes that can undermine security controls
• Restore trusted tenant configurations after incidents to support reliable recovery
• Maintain operational continuity during high-pressure scenarios such as attacks, audits, or large-scale change

CoreView Tenant Management

Alongside Tenant Resilience, Tenant Management provides the operational foundation for teams responsible for governing Microsoft 365 environments at scale. By automating routine governance and administrative controls, Tenant Management helps reduce operational strain and human error as Microsoft 365 environments grow more complex.  Organisations managing large, complex, or multi-tenant Microsoft can now:

• Maintain visibility and control across users, licenses, and delegated administration
• Reduce operational complexity that slows response and increases risk during incidents
• Enforce consistent governance across distributed or rapidly changing environments
• Support secure day-to-day operations without expanding administrative exposure

For more information, please visit https://www.coreview.com/product-tour

About CoreView

CoreView delivers cyber resilience that treats Microsoft 365 as the uniquely critical and sensitive environment it is. Whether operating multiple tenants with on-premises environments or consolidating to a single tenant, CoreView provides enterprise-grade cyber resilience, simplifies and automates M365 administration, and identifies wasted spend in your tenant. CoreView empowers over 4,000 organizations — including some of the world’s largest Microsoft tenants — to secure, consolidate, and manage complex Microsoft 365 environments.

UK Media Contact  

Fenella Johnson | Rebecca Ross

Email: coreview@3thinkrs.com

Telephone: 0208 087 2843