CVE-2026-3000 in IDExpert Windows Logon Agent
Summary
by MITRE • 03/02/2026
IDExpert Windows Logon Agent developed by Changing has a Remote Code Execution vulnerability, allowing unauthenticated remote attackers to force the system to download arbitrary DLL files from a remote source and execute them.
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Analysis
by VulDB Data Team • 03/03/2026
The CVE-2026-3000 vulnerability affects the IDExpert Windows Logon Agent software produced by Changing, presenting a critical remote code execution flaw that undermines system security. This vulnerability specifically targets the authentication and logon processes of Windows systems, creating a significant attack surface for malicious actors. The flaw allows unauthenticated remote attackers to manipulate the system's behavior by forcing it to download and execute arbitrary dynamic link library files from remote sources. This represents a fundamental breach in the system's integrity and trust model, as legitimate authentication processes become compromised.
The technical nature of this vulnerability stems from inadequate input validation and secure file handling within the IDExpert Windows Logon Agent implementation. When the system attempts to process authentication requests, it fails to properly validate the source and integrity of dynamically loaded modules, creating an opportunity for attackers to inject malicious code through the download mechanism. This flaw operates at the core of the Windows authentication framework, where the agent is designed to handle logon operations but inadvertently creates a pathway for remote code injection. The vulnerability's exploitation requires no authentication credentials, making it particularly dangerous as it can be targeted by attackers with minimal initial access requirements.
The operational impact of CVE-2026-3000 extends beyond simple remote code execution, as it fundamentally compromises the security posture of affected systems. Once exploited, attackers can establish persistent access, escalate privileges, and potentially move laterally within networks where the vulnerable software is deployed. This vulnerability affects enterprise environments where IDExpert Windows Logon Agent is commonly implemented for authentication purposes, creating widespread risk across multiple systems. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the network, making detection and containment particularly challenging. Organizations may experience complete system compromise, data exfiltration, and potential disruption of critical business operations.
Security professionals should prioritize immediate remediation efforts including applying vendor-provided patches and updates to address the vulnerability. Network segmentation and monitoring of outbound connections can help detect exploitation attempts, while implementing strict firewall rules to prevent unauthorized file downloads. The vulnerability aligns with CWE-20, which addresses improper input validation, and represents a significant risk under ATT&CK framework's T1059.001 technique for command and scripting interpreter. Organizations should conduct comprehensive vulnerability assessments to identify all instances of the affected software and implement layered security controls to prevent exploitation. Additionally, regular security audits and penetration testing should be performed to ensure that similar vulnerabilities are not present in other authentication components of the system.