CVE-2026-77691 in ManageEngine Key Manager Plus
Summary
by MITRE • 11/03/2026
ZohoCorp ManageEngine Key Manager Plus versions before 7151 allow authenticated users to enter malicious input when configuring a Microsoft CA
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified in ZohoCorp ManageEngine Key Manager Plus prior to version 7151 represents a significant security flaw within the application's certificate authority management module. Specifically, this issue affects the configuration process for Microsoft Certificate Authorities (CA). The core of the problem lies in insufficient input validation and sanitization mechanisms when handling user-supplied data during the setup or modification of CA connections. While the vulnerability requires authentication to exploit, meaning an attacker must first possess valid credentials with sufficient privileges to configure certificate authorities, it still poses a severe risk due to the high level of access typically associated with such administrative roles in enterprise environments.
From a technical perspective, this flaw is classified under CWE-74 Improper Neutralization of Special Elements used in an XML Parser (XML Injection) or potentially CWE-94 Code Injection depending on how the malicious input is processed by the backend systems interacting with the Microsoft CA infrastructure. When an authenticated user provides malformed or specially crafted input fields during the configuration wizard, the application fails to properly escape or validate these inputs before passing them to underlying system commands or XML parsers used for communication with the certificate authority. This lack of rigorous validation allows attackers to inject unintended commands or data structures that can alter the behavior of the management console or interact maliciously with the external Microsoft CA services.
The operational impact of this vulnerability extends beyond simple information disclosure. An attacker who exploits this flaw could potentially manipulate the configuration settings stored within Key Manager Plus, leading to unauthorized issuance of certificates, modification of certificate templates, or disruption of certificate lifecycle operations. In a broader enterprise context, compromising the integrity of key management systems can undermine trust in digital signatures and encrypted communications managed by that system. If an attacker gains control over CA configurations, they could issue fraudulent certificates for internal services, facilitating man-in-the-middle attacks against other applications relying on those certificates for authentication or encryption. This effectively breaks the chain of trust established by the organization's public key infrastructure.
This vulnerability aligns with MITRE ATT&CK technique T1078 Valid Accounts, as it relies on legitimate credentials to perform unauthorized administrative actions within a specific subsystem. It also relates to T1542 Pre-Attack Phase Activities if used for initial setup of malicious configurations that persist over time. The severity is heightened by the fact that Key Manager Plus often serves as a central hub for managing cryptographic keys and certificates across an organization's IT infrastructure, making it a high-value target for threat actors seeking long-term persistence or lateral movement capabilities through compromised trust relationships.
Mitigation strategies primarily involve upgrading to ZohoCorp ManageEngine Key Manager Plus version 7151 or later, where these input validation issues have been addressed by the vendor. In addition to patching, organizations should enforce strict principle of least privilege for administrative accounts within the application, ensuring that only essential personnel can configure certificate authorities. Implementing multi-factor authentication for all privileged access points adds a critical layer of defense against credential theft or misuse. Furthermore, network segmentation and monitoring of CA configuration changes through audit logs can help detect anomalous activities indicative of exploitation attempts before significant damage occurs. Regular security assessments focusing on input validation in administrative interfaces are also recommended to identify similar weaknesses across other integrated systems.