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Introduction:
The introduction of the Power Platform Inventory in the Microsoft 365 admin center represents a significant leap in administrative visibility. For cybersecurity professionals, this unified, real-time view of low-code/no-code assets is a double-edged sword, offering unparalleled oversight while simultaneously creating a new, centralized attack surface that threat actors will undoubtedly target.
Learning Objectives:
- Understand the cybersecurity implications of a centralized Power Platform inventory.
- Learn to secure the new Inventory API and manage the attack surface of Power Platform resources.
- Develop hardening strategies for Copilot Studio Agents, Power Apps, and Power Automate Flows.
You Should Know:
1. Inventory API Security Hardening
The programmatic access to the inventory via the Power Platform API is a prime target. Securing these API calls is critical to prevent data exfiltration.
Step-by-step guide:
First, connect to the Power Platform admin center using PowerShell. Always enforce Conditional Access policies and use the least privilege principle when assigning API permissions.
Connect to Power Platform Admin Center PowerShell Install-Module -Name Microsoft.PowerApps.Administration.PowerShell -Force $tenantId = "your-tenant-id" Connect-PowerApp -TenantId $tenantId
This establishes a secure, authenticated session. Next, use the `Get-AdminPowerApp` cmdlet to list all apps, but restrict the output to sensitive properties only. Avoid using broad `-Verbose` flags in production scripts that might log sensitive data. Always log these API calls to a SIEM for audit trails.
2. Auditing Copilot Studio Agents for Data Leakage
Copilot Studio Agents can process and generate large amounts of organizational data. An unsecured agent could become a data leakage channel.
Step-by-step guide:
Within the Power Platform Admin Center, navigate to the Inventory and select “Agents”. For each agent, review its connected data sources and topics. Use the following PowerShell command to extract a list of all agents and their endpoints for a security review.
Get all Copilot Studio Agents and their publication status (Example using PP Admin PowerShell)
Get-AdminPowerApp | Where-Object {$_.AppType -eq "CopilotStudioAgent"} | Select-Object DisplayName, CreatedTime, LastModifiedTime, Owner
This command helps you inventory all AI agents. Cross-reference this list with your change management database to identify any unauthorized or “shadow” AI agents deployed by business units without security review.
3. Identifying Vulnerable Canvas Power Apps
Canvas apps with improper data connections or embedded secrets are a common source of security incidents.
Step-by-step guide:
Use the Admin PowerShell to scan for apps sharing data with external tenants or using deprecated connectors, which often indicate weak security postures.
Find all Canvas Apps and check for external sharing and key connectors
Get-AdminPowerApp | Where-Object {$<em>.AppType -eq "CanvasApp"} | % {
$app = $</em>
$appName = $app.DisplayName
$appPermissions = Get-AdminPowerAppRoleAssignment -AppName $app.AppName
Check for external users
$appPermissions | Where-Object { $<em>.PrincipalType -eq "User" -and $</em>.PrincipalTenantId -ne $tenantId }
Report app if external permissions found
if ($externalUsers) { Write-Warning "App $appName is shared externally." }
}
This script identifies apps shared outside your tenant, a common misconfiguration that can lead to data spillage. Investigate any findings immediately.
4. Securing Power Automate Flows with Elevated Privileges
Flows often run with high-permission service accounts and can automate sensitive tasks. A compromised flow is a critical threat.
Step-by-step guide:
List all flows and identify those using high-privilege connections, such as those with SharePoint Administrator or Exchange Administrator rights.
Get all Flows and their trigger information (Conceptual - specific cmdlets may vary) Get-AdminFlow | Select-Object DisplayName, Enabled, Trigger, Owner
Manually, in the Inventory, click on each flow to review its connections. Look for flows that use connections with broad “Delegated” permissions. Replace these with service accounts that have only the necessary, application-specific permissions. Disable any flows that are no longer in use.
5. Real-Time Inventory Monitoring with Azure Sentinel
Integrating the Inventory API with your SIEM allows for real-time security monitoring and anomaly detection.
Step-by-step guide:
Use the Power Platform API to feed inventory data into Azure Sentinel. The following Logic App code snippet (to be run in an Azure Logic App) connects to the API and sends data to a Sentinel Custom Log.
{
"trigger": {
"kind": "Schedule",
"recurrence": {
"frequency": "Minute",
"interval": 15
}
},
"actions": {
"HTTP_Action": {
"type": "Http",
"inputs": {
"method": "GET",
"uri": "https://api.powerplatform.com/inventory/resources",
"headers": {
"Authorization": "Bearer @{parameters('servicePrincipalToken')}"
}
},
"runAfter": {}
},
"Send_to_Sentinel": {
"type": "ApiConnection",
"inputs": {
"host": {
"connectionName": "azureloganalytics"
},
"method": "post",
"body": "@body('HTTP_Action')",
"path": "/api/logs"
},
"runAfter": {
"HTTP_Action": ["Succeeded"]
}
}
}
}
This Logic App runs every 15 minutes (matching the inventory update frequency), fetches the latest inventory data, and pushes it to Azure Sentinel for analysis, allowing you to create alerts for the sudden creation of new, unapproved resources.
6. Hardening the Microsoft 365 App Builder Apps
Apps built with the Microsoft 365 App Builder (which integrate directly into Office apps) have extensive data access and require strict governance.
Step-by-step guide:
In the PowerShell module, filter for these specific app types and conduct a rigorous permission audit. The scope of these apps is often broad, accessing multiple M365 services.
Audit Microsoft 365 App Builder Apps
Get-AdminPowerApp | Where-Object {$<em>.AppType -eq "OfficeApp"} | ForEach-Object {
$appName = $</em>.DisplayName
$permissions = Get-AdminPowerAppPermissions -AppName $_.AppName
Analyze permissions for overly broad access (e.g., Sites.Read.All, Mail.Read)
$permissions | Export-Csv -Path "M365AppAudit.csv" -Append
}
Export the permissions to a CSV for analysis. Pay close attention to any app requesting `Sites.Read.All` or `Mail.Read` permissions, as these could be used to exfiltrate large volumes of SharePoint or email data if compromised.
7. Environment-Level Guardrails and Data Loss Prevention (DLP)
The inventory spans all environments. Ensuring strong DLP policies are in place at the environment level is a foundational control.
Step-by-step guide:
While the inventory provides visibility, you must use the Admin Center to create and enforce DLP policies that block connections between sensitive and non-sensitive data sources. Use PowerShell to review existing policies.
Get all DLP policies Get-DlpPolicy | Select-Object DisplayName, EnvironmentName, PolicyState
A policy in the “Enabled” state is actively enforced. Ensure that every environment containing production data has a strict DLP policy applied. Policies should explicitly block business data from being shared to consumer services like personal Outlook or public social media connectors.
What Undercode Say:
- Centralized Visibility Equals Centralized Risk: The Inventory is a high-value target. Its 15-minute update cycle means a malicious resource could operate for a significant window before detection if proactive monitoring is not in place. Securing the API access with service principals and Conditional Access is non-negotiable.
- The “Shadow IT” Reckoning: This tool will expose a vast number of previously unknown or unmanaged apps and flows. The immediate challenge for security teams will be triaging this discovered “shadow IT” without disrupting business-critical processes, requiring a balanced approach of education and enforcement.
Prediction:
The Power Platform Inventory will become a critical node in the security operations of M365 environments. Within the next 12-18 months, we predict the first major attacks will specifically target the inventory API to either spoof the data it reports (creating “ghost” resources that are hidden from admins) or to use its comprehensive access as a reconnaissance tool for identifying high-value apps and flows to compromise. Microsoft’s response will likely include more granular, security-focused role-based access control (RBAC) for the inventory itself and integration with Microsoft Defender for Cloud Apps for advanced behavioral monitoring.
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IT/Security Reporter URL:
Reported By: Carstengroth Powerplatform – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
