Improper access control in M365 Copilot allows an authorized attacker to perform spoofing locally.
CVSS Details
CVSS Score
4.4
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Configurations (Affected Products)
No configuration data available.
Microsoft 365 Copilot < 2026-05 Security Update
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# Conceptual PoC for Local Spoofing in M365 Copilot
# Requires local access and low privileges
import os
import time
def exploit_cve_2026_41100():
# Simulate payload injection into the Copilot local process
print("[+] Initiating local access control bypass...")
# In a real scenario, this might involve manipulating local files or IPC
target_process = "MsCopilot.exe"
# Check if process exists (simulated)
if target_process:
print(f"[*] Target {target_process} detected.")
# Craft the spoofing payload
# This payload intends to trick the system into accepting unauthorized commands
payload = {
"action": "spoof_identity",
"user_context": "admin_override",
"source": "local_untrusted"
}
print(f"[*] Sending payload: {payload}")
# Simulate execution
# os.system(f"tasklist | findstr {target_process}")
print("[+] Exploit successful: Spoofing achieved via improper access control.")
else:
print("[-] Target process not found.")
if __name__ == "__main__":
exploit_cve_2026_41100()