CVE-2024-38139: Microsoft Dataverse Privilege Escalation

CVE-2024-38139 Overview

CVE-2024-38139 is an improper authentication vulnerability in Microsoft Dataverse, the low-code data platform underlying Microsoft Power Platform and Dynamics 365. The flaw allows an authenticated attacker to elevate privileges over a network. Microsoft published the advisory on October 15, 2024. The weakness is classified under [CWE-287: Improper Authentication].

Successful exploitation impacts confidentiality, integrity, and availability of Dataverse environments and any downstream applications that rely on them.

Critical Impact
An authenticated attacker can escalate privileges across a networked Dataverse environment, gaining unauthorized access to data and administrative operations tied to Power Platform and Dynamics 365 workloads.

Affected Products

Microsoft Dataverse (cloud service)
Microsoft Power Platform environments backed by Dataverse
Microsoft Dynamics 365 applications using Dataverse as the data tier

Discovery Timeline

2024-10-15 - CVE-2024-38139 published to NVD
2024-10-15 - Microsoft publishes security advisory
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-38139

Vulnerability Analysis

The vulnerability resides in the authentication logic of Microsoft Dataverse. An attacker who already holds valid low-privilege credentials to a Dataverse environment can exploit the flaw to bypass authentication checks that separate privilege tiers. This results in vertical privilege escalation across the service.

Because Dataverse serves as the central data store for Power Apps, Power Automate flows, and Dynamics 365 modules, elevated access exposes business records, connectors, and automation logic. Microsoft categorizes the issue under [CWE-287], indicating that identity verification is performed incorrectly or incompletely for at least one privileged code path.

The attack requires network access and low complexity, with no user interaction. Microsoft mitigated the issue through a service-side update, so no customer action is required for the cloud service itself.

Root Cause

The root cause is improper enforcement of authentication controls on a Dataverse operation reachable by authenticated principals. Rather than fully validating the caller's identity and role before granting access to a higher-privilege operation, the affected code path accepts credentials or tokens that should not authorize the requested action.

Attack Vector

Exploitation occurs over the network against Dataverse service endpoints. The attacker must first authenticate as a valid user of the target Dataverse environment. From that foothold, the attacker issues crafted requests to the vulnerable component to obtain privileges beyond their assigned role.

No verified proof-of-concept exploit is publicly available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Microsoft Security Update Guide for authoritative technical details.

Detection Methods for CVE-2024-38139

Indicators of Compromise

Unexpected role assignment or security role changes within a Dataverse environment applied by non-administrative accounts.
Access to Dataverse tables, plugins, or system jobs by user principals that historically lacked those permissions.
Anomalous API calls to Dataverse Web API endpoints from user accounts outside their normal usage patterns or geographies.

Detection Strategies

Review Microsoft Purview audit logs for Dataverse activity, focusing on privilege changes, entity permission modifications, and administrative actions.
Correlate Entra ID sign-in logs with Dataverse audit events to identify sessions where a low-privilege user performed high-privilege operations.
Baseline normal Power Platform admin activity and alert on deviations, particularly for Business Unit, Security Role, and System Administrator changes.

Monitoring Recommendations

Enable and retain Dataverse auditing on all production environments, including read auditing for sensitive tables.
Forward Power Platform and Entra ID logs to a centralized analytics platform for cross-source correlation.
Alert on failed then successful authentication sequences followed by privilege-sensitive operations within a short time window.

How to Mitigate CVE-2024-38139

Immediate Actions Required

Confirm your tenant received the Microsoft service-side fix by reviewing the Microsoft advisory for CVE-2024-38139.
Audit Dataverse security roles and remove standing privileges that are not required for daily operations.
Rotate credentials and reset sessions for accounts showing anomalous Dataverse activity since October 2024.
Review application users and service principals connected to Dataverse and revoke unused or over-permissioned identities.

Patch Information

Microsoft addressed CVE-2024-38139 through a service-side update to Microsoft Dataverse. Customers using the managed cloud service do not need to install a patch. Verify remediation and read the vendor guidance at the Microsoft Security Update Guide.

Workarounds

Enforce least privilege on Dataverse security roles and restrict membership of System Administrator and System Customizer.
Require phishing-resistant multi-factor authentication for all Entra ID accounts with access to Power Platform.
Apply Conditional Access policies that limit Dataverse access to compliant devices and trusted network locations.
Restrict environment creation and management to a dedicated administrative group and monitor changes to that group.

bash

# Example: enumerate Dataverse security roles and members for review
# Requires the Microsoft.PowerApps.Administration.PowerShell module
Add-PowerAppsAccount
Get-AdminPowerAppEnvironment | ForEach-Object {
    $envId = $_.EnvironmentName
    Write-Host "Environment: $envId"
    Get-AdminPowerAppRoleAssignment -EnvironmentName $envId |
        Where-Object { $_.RoleName -in @('System Administrator','System Customizer') } |
        Select-Object PrincipalDisplayName, PrincipalType, RoleName
}