CVE-2026-75825 in ManageEngine OpManager
Summary
by MITRE • 09/23/2026
ZohoCorp ManageEngine OpManager versions 12.8.710 and below with the Application Manager Plugin enabled were vulnerable to an Authentication Bypass vulnerability.
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Analysis
by VulDB Data Team • 09/23/2026
The identified security flaw resides within Zoho Corp's ManageEngine OpManager, specifically affecting version 12.8.710 and earlier releases when the Application Manager plugin is active. This vulnerability constitutes a critical authentication bypass mechanism that allows unauthorized actors to gain access to sensitive administrative functions without providing valid credentials. The root cause of this issue lies in the improper validation or handling of session tokens and request parameters within the application manager module, which fails to enforce strict identity verification before processing privileged operations. By exploiting specific sequences of HTTP requests crafted by an attacker, it is possible to manipulate the internal state management logic, effectively tricking the server into treating unauthenticated traffic as legitimate administrative activity. This type of flaw typically stems from a failure to properly associate user sessions with their corresponding authentication states or from insufficient checks on input parameters that dictate access control decisions within the web application framework.
From an operational perspective, the impact of this vulnerability is severe due to the elevated privileges associated with the ManageEngine OpManager interface. An attacker who successfully exploits this flaw can bypass login screens and directly interact with configuration settings, monitor system performance data, or potentially execute commands depending on the specific capabilities exposed by the Application Manager plugin. This compromise undermines the fundamental security principle of least privilege and exposes critical infrastructure monitoring tools to malicious manipulation. The ability to access these interfaces without authentication means that any individual with network connectivity to the affected service can view sensitive operational metrics, modify alert thresholds, or disrupt monitoring services, leading to potential denial of service conditions or blind spots in an organization's security posture where anomalies go undetected due to tampered configurations.
In terms of industry classification standards, this vulnerability aligns closely with CWE-287, which describes Improper Authentication, as the system fails to correctly verify the identity of a user prior to granting access. Furthermore, it maps to MITRE ATT&CK technique T1078, specifically Valid Accounts or Default Accounts if default credentials are leveraged in conjunction with this bypass, illustrating how attackers can establish persistence and maintain unauthorized presence within an environment by exploiting weaknesses in authentication mechanisms rather than brute-forcing passwords. The exploitation path often involves crafting specific requests that exploit the logic gap in session validation, a pattern consistent with CWE-613 regarding Insufficient Session Expiration or improper state management in web applications.
To mitigate this risk, organizations running ManageEngine OpManager must immediately apply the latest available patches provided by Zoho Corp for versions 12.8.710 and below. It is imperative to verify that all instances of the Application Manager plugin are updated to a version where the authentication logic has been hardened against bypass attempts. Additionally, administrators should implement network-level controls such as firewalls or reverse proxies to restrict access to the OpManager interface exclusively from trusted IP addresses, thereby reducing the attack surface available for exploitation. Enabling multi-factor authentication adds an additional layer of security that can mitigate the impact even if a single-sign-on or session bypass is attempted. Regular vulnerability scanning and penetration testing should be conducted to ensure no residual exposure remains after patching, particularly focusing on areas where custom plugins interact with core application logic.