CVE-2026-80214 in LibreNMS
Summary
by MITRE • 08/26/2026
LibreNMS’s Virtualization Discovery module is vulnerable to command line injection. An authenticated admin user can execute arbitrary code on the host server.
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified in LibreNMS affects the Virtualization Discovery module, presenting a critical risk of remote code execution through command-line injection. This flaw arises from insufficient sanitization or validation of input data within the specific functionality responsible for discovering and managing virtualized environments on monitored hosts. As an authenticated administrator user interacts with this module to initiate discovery processes or configure settings related to virtual machines, the application fails to properly escape special characters in the supplied parameters before passing them to underlying system commands. This lack of rigorous input validation allows a malicious actor who has obtained administrative credentials to inject arbitrary shell commands into the execution context of the LibreNMS server process.
From a technical perspective, this vulnerability is classified under CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The attacker leverages their authenticated status to bypass initial access controls and targets the specific API endpoints or web interface actions that trigger system-level calls for virtualization discovery. By manipulating input fields such as hostnames, IP addresses, or configuration parameters associated with hypervisors like VMware vCenter, Proxmox, or Hyper-V integrations within LibreNMS, the attacker can append malicious commands using standard shell metacharacters such as semicolons, ampersands, or pipes. These characters allow the injection of additional instructions that are executed by the operating system shell with the privileges of the user running the LibreNMS application, which is typically a dedicated service account but may still possess significant local access rights depending on deployment configurations.
The operational impact of this vulnerability is severe, as it effectively grants an authenticated administrator full control over the underlying host server where LibreNMS is deployed. Once arbitrary code execution is achieved, the attacker can perform actions ranging from reading sensitive configuration files and database credentials to installing backdoors, pivoting to other systems on the internal network, or exfiltrating data. Since administrative access in monitoring platforms often implies trust within an organization's security perimeter, this compromise undermines the integrity of the entire infrastructure management layer. The attacker could potentially disable logging mechanisms, modify alerting rules to hide further malicious activity, or use the compromised server as a launchpad for lateral movement against other critical assets that are monitored by LibreNMS but not directly protected by endpoint detection systems.
This vulnerability aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter abuse, specifically T1059 which covers various scripting languages used during execution phases of an attack chain. It also relates to Initial Access vectors where valid accounts are exploited for persistence or privilege escalation within the monitored environment. The severity is heightened by the fact that administrative access is often granted based on role-based trust assumptions rather than strict least-privilege principles, making the exploitation path straightforward for any insider threat or external attacker who has compromised an admin account through phishing, credential stuffing, or other means.
Mitigation strategies must focus immediately on patching to the latest version of LibreNMS where this input validation issue is resolved by developers implementing proper escaping and whitelisting mechanisms for all inputs passed to system commands. In addition to software updates, organizations should enforce strict network segmentation to limit access to the LibreNMS server from untrusted networks and ensure that the service account running LibreNMS operates with minimal privileges necessary for its function, adhering to principle of least privilege. Multi-factor authentication should be enforced for all administrative accounts to reduce the risk of credential compromise leading to exploitation. Furthermore, continuous monitoring for anomalous command executions or unusual outbound connections from the server can help detect potential exploitation attempts in real-time before significant damage occurs. Regular security audits and penetration testing focused on input validation flaws are recommended to identify similar weaknesses across other modules within the platform.