Server side cache poisioning

Steps to reproduce:

1. For testing purpose i've used https://zabbix-stage-dal10.ole.redhat.com/
    
   testcase : 1
    
   adding : ;
    
   https://zabbix-stage-dal10.ole.redhat.com/; 
   redirected to normal page
    
   test case 2: 
    
   https://zabbix-stage-dal10.ole.redhat.com/;echo%20MPCSBG$((282037%2B31337))
    
   again redirected to normal page
    
   Final payload
   https://zabbix-stage-dal10.ole.redhat.com/;echo%20MPCSBG$((282037%2B31337))$(echo%20MPCSBG)MPCSBG/got 500 internal status and cache got reflectedits now cached in server side

see screenshot 1
 
when we tried to give data on username and password it redirects to
https://zabbix-stage-dal10.ole.redhat.com/;echo%20MPCSBG$((282037%2B31337))$(echo%20MPCSBG)MPCSBG/index.php
 
 
Result file not found :
screenshot 2

Result:
see screenshot 1 &2
Expected:
should not cache on server

should not display any data on 500 status