CVE-2026-2459 in Relion REB500
Summary
by MITRE • 02/24/2026
A vulnerability exists in REB500 for an authenticated user with Installer role to access and alter the contents of directories that the role is not authorized to do so.
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Analysis
by VulDB Data Team • 02/28/2026
The vulnerability identified as CVE-2026-2459 represents a critical authorization flaw within the REB500 system that allows authenticated users with the Installer role to bypass intended access controls and manipulate directory contents they should not be authorized to modify. This issue stems from insufficient privilege validation mechanisms that fail to properly enforce the principle of least privilege for users possessing the Installer role.
The technical implementation of this vulnerability demonstrates a clear breakdown in access control enforcement where the system does not adequately verify whether an Installer role user possesses legitimate authorization to access or modify specific directory structures. This flaw operates at the authorization layer of the application security model, where the system fails to maintain proper access control boundaries between different user roles and their respective directory permissions. The vulnerability specifically affects the directory access control mechanisms that should normally restrict Installer role users from modifying content in directories outside their designated scope of operations.
From an operational impact perspective, this vulnerability creates significant security risks for organizations deploying REB500 systems, as it allows malicious or compromised Installer role users to potentially access sensitive data, modify critical system files, or disrupt normal operations by altering directory contents that should remain protected. The unauthorized access capability extends beyond simple data viewing to include modification operations, which can lead to data integrity compromise and potential system instability. Attackers could exploit this vulnerability to escalate their privileges or establish persistence within the system by modifying directory structures that should be protected from their role level.
The vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and demonstrates characteristics consistent with privilege escalation vulnerabilities in access control systems. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, as it allows unauthorized directory manipulation that could be leveraged to maintain access or establish covert control over system resources. Organizations should consider this vulnerability as part of their broader security posture assessment, particularly in environments where multiple user roles exist and where proper segregation of duties is critical for maintaining system integrity.
Mitigation strategies should focus on implementing robust access control validation mechanisms that enforce strict role-based access controls for directory operations. Security patches should address the underlying authorization logic to ensure that Installer role users cannot access or modify directories outside their designated permissions. Organizations should also implement monitoring and logging of directory access attempts to detect potential exploitation attempts. Regular access control reviews and privilege audits should be conducted to ensure that role assignments align with organizational security policies and that the principle of least privilege is properly enforced throughout the system architecture.