CVE-2026-100286 in Server
Summary
by MITRE • 09/29/2026
Missing authorization in the data source settings API in Devolutions Server 2026.3.5.0 and earlier allows an authenticated non-administrative user to disclose integration secrets via a crafted API request.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in Devolutions Server versions 2026.3.5.0 and prior represents a critical failure in access control mechanisms within the data source settings application programming interface. This flaw specifically affects authenticated users who do not possess administrative privileges, allowing them to bypass intended security restrictions through specially crafted API requests. The core issue lies in the server's inability to properly verify whether the requesting user has sufficient authority to view or modify sensitive configuration parameters associated with integrated services and external data sources.
From a technical perspective, this is classified as an improper access control vulnerability where the application fails to enforce proper authorization checks on specific endpoints responsible for retrieving or updating integration secrets. These secrets typically include API keys, authentication tokens, connection strings, or other credentials required for third-party integrations. When a non-administrative user sends a request to these settings endpoints, the server processes it without validating that the user's role permits such access. This lack of enforcement allows the attacker to extract confidential information that should remain restricted to system administrators and authorized personnel only.
The operational impact of this vulnerability is severe due to the nature of the exposed data. Integration secrets are often high-value targets for attackers because they can serve as a gateway into broader network ecosystems or cloud environments connected via these integrations. Disclosure of such credentials enables unauthorized access to external services, potential lateral movement within an organization's infrastructure, and compromise of sensitive business logic dependent on those integrated systems. Furthermore, if the exposed secrets have broad permissions, the attacker could potentially manipulate data sources, exfiltrate large volumes of organizational data, or disrupt service availability by altering critical configuration settings without detection.
This vulnerability aligns with CWE-269, which describes Improper Privilege Assignment, as well as CWE-862, Missing Authorization, highlighting the fundamental breakdown in enforcing role-based access controls. In terms of adversary behavior mapping under MITRE ATT&CK, this flaw facilitates techniques associated with Credential Access and Discovery phases, specifically allowing attackers to gather sensitive information from cloud environments or internal systems through API exploitation. The ability to retrieve secrets via an authenticated but unauthorized user account underscores the importance of implementing strict object-level authorization checks rather than relying solely on general authentication status.
To mitigate this risk, organizations running affected versions must immediately apply vendor-provided patches that address the access control logic in the data source settings API. Until patching is feasible, administrators should implement network-level controls such as web application firewalls to restrict direct API access for non-administrative accounts or monitor API logs for anomalous requests targeting sensitive configuration endpoints. Additionally, rotating any integration secrets that may have been exposed during the period of vulnerability exploitation is essential to prevent further compromise. Regular audits of user permissions and enforcement principle of least privilege across all administrative interfaces will help reduce the attack surface for similar access control failures in future deployments.