Nagios XI Network Monitor prior to Graph Explorer component version 1.3 contains a command injection vulnerability in `visApi.php`. An authenticated user can inject system commands via unsanitized parameters such as `host`, resulting in remote code execution.
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.