CVE-2026-3131 in Server
Summary
by MITRE • 02/24/2026
Improper access control in multiple DVLS REST API endpoints in Devolutions Server 2025.3.14.0 and earlier allows an authenticated user with view-only permission to access sensitive connection data.
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Analysis
by VulDB Data Team • 02/28/2026
The vulnerability identified as CVE-2026-3131 represents a critical access control flaw within the Devolutions Server platform, specifically affecting versions 2025.3.14.0 and earlier. This issue resides within the Distributed Virtual Load Sharing (DVLS) REST API endpoints, which are integral components of the server's architecture designed to manage and distribute virtual resources across multiple systems. The flaw manifests as an improper access control mechanism that fails to adequately validate user permissions before granting access to sensitive connection data. This vulnerability directly contravenes the principle of least privilege and demonstrates a failure in implementing proper authorization checks within the application's API layer.
The technical implementation of this vulnerability stems from inadequate validation of user permissions within the DVLS REST API endpoints. An authenticated user who possesses only view-only permissions should theoretically be restricted from accessing sensitive connection data that typically requires elevated privileges. However, the flawed access control implementation allows these users to bypass normal permission boundaries and retrieve connection information that should remain protected. This represents a classic case of insufficient authorization checks where the system fails to properly verify whether the requesting user has adequate privileges to access specific resources. The vulnerability can be classified under CWE-284, which addresses improper access control issues, and specifically aligns with ATT&CK technique T1078.004 related to valid accounts and credential access.
The operational impact of this vulnerability extends beyond simple data exposure, potentially enabling attackers to gain insights into network configurations, authentication credentials, and connection parameters that could facilitate further attacks. An authenticated user with view-only permissions could leverage this flaw to access sensitive information that might include connection strings, authentication tokens, or other connection-related metadata that could be exploited for lateral movement within the network. This vulnerability essentially undermines the security model of the Devolutions Server by allowing users to escalate their privileges through data access rather than through direct system exploitation. The impact is particularly concerning given that the affected version includes a broad range of DVLS endpoints, meaning the vulnerability could potentially affect multiple system components and data sources within the platform's ecosystem.
Organizations utilizing Devolutions Server versions 2025.3.14.0 and earlier should prioritize immediate remediation through the application of available patches or updates from Devolutions. The recommended mitigation strategy involves implementing proper access control validation within all DVLS REST API endpoints, ensuring that each request undergoes comprehensive permission verification before any sensitive data is returned. Additionally, organizations should conduct thorough access control reviews to identify and remediate similar issues within their broader application landscape. Network segmentation and monitoring of API access patterns should be implemented to detect anomalous behavior that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of maintaining proper authorization boundaries within API implementations and highlights the need for regular security assessments of authentication and access control mechanisms to prevent similar issues from arising in the future.