CVE-2026-12370 in Network Configuration Manager
Summary
by MITRE • 09/23/2026
ZohoCorp ManageEngine OpManager, NetFlow Analyzer, and Network Configuration Manager versions 12.8.667 and below were vulnerable to a Server-Side Template Injection vulnerability in Configlet processing, which could lead to Remote Code Execution.
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Analysis
by VulDB Data Team • 09/23/2026
The identified vulnerability represents a critical security flaw within the configuration management modules of ZohoCorp ManageEngine products, specifically affecting OpManager, NetFlow Analyzer, and Network Configuration Manager versions 12.8.667 and earlier. This issue is classified as Server-Side Template Injection, which falls under the Common Weakness Enumeration category CWE-94 for Improper Control of Generation of Code or Script. The root cause lies in the application's handling of user-supplied input during the processing of Configlets, which are reusable configuration snippets used to automate network device configurations. When these inputs are not adequately sanitized before being passed to a template engine, an attacker can inject malicious script code that is executed on the server side rather than within the client browser context typical of cross-site scripting vulnerabilities.
The technical mechanism exploits the dynamic nature of template engines which often allow for variable interpolation and function calls during rendering. By crafting specific payloads containing special characters or syntax recognized by the underlying templating framework, an attacker can bypass intended logic flows. This injection allows the execution of arbitrary commands within the context of the application server process. Since these ManageEngine products typically run with elevated privileges to interact with network infrastructure devices, successful exploitation grants the attacker a high-level foothold on the compromised system. The vulnerability is particularly dangerous because it does not require complex pre-authentication steps in all scenarios and can potentially be triggered through specific configuration updates or imports that are part of normal administrative workflows.
The operational impact of this Server-Side Template Injection is severe, leading directly to Remote Code Execution. An authenticated attacker with access to the Configlet management interface could exploit this flaw to execute system commands on the underlying operating system hosting the ManageEngine application. This capability allows for complete compromise of the server, including the ability to read sensitive data such as network credentials stored in configuration files, modify existing configurations to disrupt network operations, or install persistent backdoors. Furthermore, because these tools manage critical network infrastructure, an attacker could use this access to pivot into other parts of the internal network, escalating their reach and potentially causing widespread service disruption across the organization's IT environment.
To mitigate this risk, organizations must immediately apply the vendor-provided patches for OpManager, NetFlow Analyzer, and Network Configuration Manager by upgrading to versions newer than 12.8.667. Until patching is feasible, administrators should restrict access to the Configlet management interfaces using strict network segmentation or firewall rules that limit exposure to trusted IP addresses only. Additionally, implementing Web Application Firewalls with specific signatures for template injection patterns can provide a layer of defense against exploitation attempts. It is also advisable to review audit logs for any suspicious activity related to configuration imports or updates prior to patching, as this may indicate ongoing exploitation efforts aligned with ATT&CK techniques involving command and control via legitimate application features.