The "system" function receives untrusted input from the user. If the "EnableJSCaching" option is enabled, it is possible to execute arbitrary code provided as the "Module" parameter.
The RunCommand function accepts any parameter, which is then passed for execution in the shell. This allows an attacker to execute arbitrary code on the system.
In the Print.pl service, the "uhcPrintServerPrint" function allows execution of arbitrary code via the "CopyCounter" parameter.