PRTG Network Monitor before 18.3.44.2054 allows a remote authenticated attacker (with read-write privileges) to execute arbitrary code and OS commands with system privileges. When creating an HTTP Advanced Sensor, the user's input in the POST parameter 'proxyport_' is mishandled. The attacker can craft an HTTP request and override the 'writeresult' command-line parameter for HttpAdvancedSensor.exe to store arbitrary data in an arbitrary place on the file system. For example, the attacker can create an executable file in the \Custom Sensors\EXE directory and execute it by creating EXE/Script Sensor.
An issue was discovered in PRTG Network Monitor before 18.2.39. An attacker who has access to the PRTG System Administrator web console with administrative privileges can exploit an OS command injection vulnerability (both on the server and on devices) by sending malformed parameters in sensor or notification management scenarios.
Cross-site scripting (XSS-STORED) vulnerability in the DEVICES OR SENSORS functionality in Paessler PRTG Network Monitor before 17.3.33.2654 allows authenticated remote attackers to inject arbitrary web script or HTML.
Cross-site scripting (XSS) vulnerability in Paessler PRTG Network Monitor before 17.2.32.2279 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
XML external entity vulnerability in PRTG Network Monitor before 16.2.23.3077/3078 allows remote authenticated users to read arbitrary files by creating a new HTTP XML/REST Value sensor that accesses a crafted XML file.