Control external user access
In a Microsoft 365 environment where collaboration drives productivity, managing external access has become a major challenge for security teams. Teams, SharePoint, OneDrive, and other collaboration platforms provide countless sharing capabilities. Without proper governance, however, security risks can quickly escalate. And building an M365 environment where everything is perfectly configured is often easier said than done.
64%
of IT teams do not have an effective way to control sharing with people outside the organization.
*Source: IDECSI, 2022
68%
of organizations are targeted by cyberattacks on a daily basis, often enabled by poorly managed access controls.
*Source: BusinessWire, 2025
80%
of security breaches in certain industrial environments are linked to open sharing practices or unmanaged access.
*Source: IDECSI, 2023
Key challenges: securing external collaboration
- Lack of visibility and control over guest activity: monitoring groups, guest accounts, and external sharing can be complex and costly, often requiring additional tools such as Microsoft Entra ID P2 or Microsoft SAM.
- Complex permission management: access reviews and entitlement management require significant resources and ongoing oversight.
- Managing identities over time: Who still has access? Since when? For what purpose? These questions are often difficult to answer.
- Increased data overexposure: As collaborative workspaces become more open, the risk of data overexposure grows. Shared information frequently exceeds actual business needs.
- Establishing Secure External Collaboration Practices: Organizations need clear governance rules and guardrails to enable secure collaboration with external users.
Take Control of External Sharing with IDECSI
IDECSI provides a simple, centralized approach to regaining control of external access across Microsoft 365.
- Complete visibility gain a comprehensive view of external access across: SharePoint, Teams, Microsoft 365 Groups, OneDrive. Both tenant-level and site-level external users are identified and monitored over time.
- Data exposure risk analysis identify situations where external access may create data overexposure risks.
- Automated access reviews IDECSI automates external access reviews without requiring Microsoft Entra ID P2 or Microsoft SAM.
IDECSI enables organizations to remove unnecessary access and excessive permissions on sensitive data.
Capabilities include:
- Bulk remediation actions for high-risk situations
- Automated governance and remediation policies
- Continuous monitoring of external identities and permissions
Data owners can review and validate sharing permissions directly from a single portal. Users are engaged at the right time through a guided, user-friendly experience, allowing them to confirm legitimate access needs while eliminating unnecessary permissions.
Benefits
Agile and efficient governance
A continuous, transparent, and non-intrusive process managed through a single platform. No more juggling multiple tools to audit sharing activities.
Stronger security
Maintain complete control over external identities and access to sensitive resources.
Consolidated sharing visibility
Access clear dashboards, exposure indicators, and ready-to-use reports for compliance and audit purposes.
Secure collaboration without friction
Users collaborate freely while remaining compliant with governance policies and security best practices.
Discover DETOX for Microsoft 365
DETOX is a turnkey solution designed to help organizations identify all external links and access permissions across Microsoft 365 and revoke illegitimate access within just a few weeks.
Trusted by leading organizations
“Thanks to MyDataSecurity, we have not only improved our organisation’s visibility of cybersecurity, but we have also reduced the risks associated with unauthorised access.”
Jean-Paul Joanany
CISO
“IDECSI helps us to minimise usage issues and potential security vulnerabilities. The sheer volume of data requires a standardised solution and means users must take responsibility for data governance.”
Antoine Ancel
ex Head of Operational Cyber Security
“Thanks to the MyDataSecurity solution, staff are actively involved in protecting the data they share in Microsoft 365. This helps address two key challenges: understanding how data is shared and keeping it secure.”
Islem Djouini
CISO Corporate
BPCE-IT customer story
“These campaigns allowed us to reduce our data exposure, 10,000 corrections were made, and the objective has been reached. Users are satisfied with the solution’s ergonomics and appreciate being at the heart of the process.”
Talk to an expert
Schedule time with one of our experts to discuss your external access governance challenges.
