CVE-2026-25656 in SINEC NMS
Summary
by MITRE • 02/10/2026
A vulnerability has been identified in SINEC NMS (All versions), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 02/10/2026
The vulnerability CVE-2026-25656 affects the SINEC Network Management System user management component across all versions prior to V2.15.2.1. This issue represents a critical privilege escalation vulnerability that stems from inadequate access controls within the configuration management subsystem. The affected system operates as a network management solution that handles user authentication and authorization processes, making it a prime target for attackers seeking to elevate their privileges within the network infrastructure.
The technical flaw manifests through improper file permission handling within the User Management Component where low-privileged users can manipulate configuration files that should be restricted to administrative access only. This misconfiguration allows unauthorized users to modify critical system files that control application behavior and module loading processes. The vulnerability specifically impacts the application's ability to validate file modifications, failing to properly authenticate or authorize changes to sensitive configuration parameters that govern dynamic link library loading sequences.
From an operational impact perspective, this vulnerability creates a severe attack surface that enables attackers to execute arbitrary code with SYSTEM privileges, representing a complete compromise of the affected system. The ability to load malicious DLLs through configuration file manipulation provides attackers with persistent access to network management functions, potentially allowing them to intercept communications, modify network policies, or establish backdoors within the enterprise network. This vulnerability directly maps to CWE-276 which describes inadequate privileges for file operations, and aligns with ATT&CK technique T1068 which covers local privilege escalation through configuration flaws.
The exploitation of this vulnerability requires minimal privileges initially but can result in complete system compromise, making it particularly dangerous in enterprise environments where network management systems serve as critical infrastructure components. Organizations running affected versions of SINEC NMS should immediately implement mitigations including applying the vendor-provided patch to version 2.15.2.1 or higher, implementing network segmentation to isolate management systems, and conducting thorough access control reviews. Additionally, security monitoring should be enhanced to detect unauthorized configuration file modifications and anomalous DLL loading activities that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper privilege separation and file access controls in network management systems where administrative functions are exposed to potentially untrusted user populations.