CVE-2026-18911 in ManageEngine DataSecurity Plus
Summary
by MITRE • 09/18/2026
ManageEngine DataSecurity Plus versions before 6310 are vulnerable to an agent authentication bypass, allowing unenrolled agents to send requests without proper authentication.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in ManageEngine DataSecurity Plus prior to version 6310 represents a critical failure in the access control mechanisms governing communication between client-side agents and the central management server. This flaw specifically targets the agent registration and authentication protocol, which is designed to ensure that only authorized, enrolled endpoints can interact with sensitive data protection services. By exploiting this weakness, an attacker who has network connectivity to the affected system can bypass the mandatory authentication checks required for agent enrollment or operation. The core technical issue lies in the insufficient validation of credentials during the initial handshake or request processing phase, allowing unenrolled agents to masquerade as legitimate components of the security infrastructure without possessing valid certificates or tokens.
From a technical perspective, this vulnerability falls under the category of Broken Access Control and Authentication Bypass, aligning with CWE-287 (Improper Authentication) and CWE-434 (Unrestricted Upload of File with Dangerous Type if file upload is involved in the enrollment process). The absence of rigorous verification allows an adversary to inject malicious requests into the system. Since DataSecurity Plus handles sensitive data discovery, classification, and protection across enterprise environments, the ability for unauthorized agents to communicate with the server creates a significant attack surface. These rogue agents can potentially exfiltrate classified information, modify security policies, or disrupt monitoring capabilities without triggering standard alerting mechanisms designed to detect anomalous behavior from unregistered devices.
The operational impact of this vulnerability is severe due to the privileged nature of agent operations within DataSecurity Plus environments. Agents typically possess elevated permissions necessary for scanning file shares, databases, and cloud storage for sensitive data patterns such as personally identifiable information or financial records. An attacker leveraging this authentication bypass can establish a persistent foothold on the network by enrolling malicious agents that appear legitimate to the management console. This facilitates lateral movement and allows for the systematic extraction of high-value data assets protected by the software itself, effectively neutralizing the security controls intended to safeguard them. Furthermore, it undermines the integrity of audit logs and compliance reporting features, as actions performed through these unauthorized channels may not be properly attributed or recorded in a manner that satisfies regulatory requirements like GDPR, HIPAA, or PCI-DSS.
In terms of threat modeling, this vulnerability maps directly to MITRE ATT&CK techniques related to Initial Access via Valid Accounts (T1078) and Defense Evasion through Masquerading (T1036). The attacker utilizes the trusted relationship between agents and servers to blend in with normal traffic patterns. To mitigate this risk, organizations must immediately upgrade ManageEngine DataSecurity Plus to version 6310 or later, where these authentication checks have been hardened. Additionally, network segmentation strategies should be employed to restrict communication between endpoints and the management server to known IP ranges using firewall rules. Implementing mutual TLS (mTLS) for all agent-server communications adds an additional layer of cryptographic verification that is resistant to simple credential bypass attempts. Regular auditing of enrolled agents against a baseline inventory can also help detect any unauthorized entities that may have exploited this vulnerability before patches were applied.